This study used an anonymous, independent pre-post design to evaluate the impact of a multicomponent, longitudinal sun safety public health education campaign among young adults. The campaign was conducted at a private university during the 2024‐2025 academic year. The project was part of the institution’s designation as an SSC, a national initiative led by the National Council on Skin Cancer Prevention that recognizes schools for their commitment to reducing UVR exposure among young adults [41]. All SSC infrastructure, including some campus sunscreen dispensers, was in place prior to the baseline assessment period. Anonymous, independent presurveys and postsurveys were administered online such that participant overlap could not be determined. The surveys collected data on respondents’ sun safety knowledge, behaviors, and campaign awareness over time.

Eligible participants were aged 18 years or older and enrolled at the university through an undergraduate, graduate, or professional degree program. Recruitment occurred through university-managed social media, tabling events, and campus organization listserv emails. This approach was selected for its feasibility and alignment with evaluating a campus-based public health campaign in a real-world university setting. All survey data were collected using a mobile-friendly online platform (Qualtrics). To support eligibility verification while maintaining anonymity, access to the survey required a university-affiliated email login, and eligibility criteria (age and enrollment status) were self-reported. The study protocol was reviewed and deemed exempt by the university’s institutional review board.

Social media posts also promoted other components of the university’s SSC designation, including on-campus sunscreen dispensers, signage, and online educational materials. As part of the university’s SSC designation, skin cancer prevention information was included on the student health center’s website, and related studies were published in the student newspaper and a campus newsletter. These materials highlighted the four publicly accessible on-campus sunscreen dispensers installed in high-traffic indoor locations (eg, dining areas) to increase access to UVR protection. These installations occurred prior to the deployment of the presurvey and before the start of the social media campaign. Given the high levels of sun exposure associated with physical activity and exercise, 3 additional sunscreen dispensers were installed at athletic facilities during the campaign period, increasing the total number of dispensers to seven. Educational signage accompanied the dispensers and was displayed throughout campus, including residence halls and academic buildings, to reinforce daily sunscreen use and promote year-round sun safety. This information was also clearly shared on the SSC Instagram account. Additional implementation details, including dispenser placement, are described by Perez et al [41].

Cross-sectional postsurvey data were analyzed using SPSS version 29.0. Descriptive statistics were used to summarize demographic and behavioral characteristics. Chi-square tests assessed categorical variables (eg, dispenser use by Instagram followers). Independent samples t tests compared sun safety behaviors across other factors (eg, skin tone, Instagram following, and dispenser use). Finally, logistic regression analysis was used to identify cofactors of sun safety. The model’s independent variables were selected based on their potential relevance to UVR risk perception, previous evidence that social media health campaigns impact cancer-preventive behaviors, and bivariate associations observed within the postsurvey dataset (P<.10) [50].

This study was exempt from review by the Georgetown University Institutional Review Board (STUDY00008246). Informed consent was obtained from all participants involved in the study. The study protocol was reviewed and deemed exempt by the university’s Institutional Review Board. All data were collected and stored in compliance with the Health Insurance Portability and Accountability Act (HIPAA).

In fall 2024, the university enrolled approximately 7800 undergraduate and 8900 graduate or professional students, totaling an estimated 16,700 students. Of the 85 outreach emails sent to 75 unique university organizations, ultimately 10 with established Instagram accounts reposted SSC Instagram content. This extended the potential reach to 5711 Instagram followers, or roughly one-third of the student body.

A total of 230 participants completed the precampaign survey and 267 completed the postcampaign survey (Table 1). Due to the anonymous and independent nature of the surveys, some participant overlap may have occurred. As illustrated in Table 1, presurvey and postsurvey demographic characteristics were comparable [41]; they are presented to help characterize the samples and provide context for the social media–focused analyses.

Precampaign participants had a mean age of 23.7 (SD 3.1), were predominantly female (160/230, 69.6%), and represented a diverse racial composition (Asian or Pacific Islander: 76/230, 33.0%; Black or African American: 21/230, 9.1%; Middle Eastern: 22/230, 9.6%; Hispanic: 18/230, 7.8%). More than half of the participants were enrolled in a health profession program (150/230, 65.2%). The majority reported keeping up with university news through emails (199/230, 86.5%) or university-managed social media accounts (107/230, 46.5%), highlighting the prominence of digital communication platforms in reaching this demographic.

Postcampaign demographics were comparable to those observed precampaign, with a similar average age of 23.3 (SD 3.0) and a predominantly female sample, consistent with the precampaign cohort (176/267, 65.9%; Table 1). Racial diversity was similar to that of the precampaign sample, and both samples included fewer than 10% Hispanic respondents. As in the precampaign group, more than half of participants were enrolled in a health professions program (146/267, 54.7%).

In the postcampaign sample only, athletic facility usage and skin type distribution were measured. Athletic facility usage was common, with 89.1% (238/267) reportedly visiting to some extent, as defined by selecting any response other than “never” on the 5-point Likert scale. Of these participants, more than half reported visiting very frequently, as indicated by selecting “often” (n=98) and “always” (n=32). This finding supported the strategic placement of additional sunscreen dispensers at athletic facilities across campus.

Skin type distribution in the postsurvey sample showed that 61.4% (164/267) identified as types I-II (lighter skin types) and 38.6% (103/267) as types III-VI (darker skin types). Skin type demonstrated clear variation across racial groups: among White participants (n=121), nearly all reported lighter skin tones, with 49.6% (60/121) identifying as type I; 38.0% (46/121) as type II; 12.4% (15/121) as type III; and none identifying above type III. Asian American or Pacific Islander participants (n=80) showed a broader distribution, including types II (36/80, 45.0%), III (24/80, 30.0%), and IV-V (17/80, 15.3%). The majority of Black or African American participants (n=17) reported darker skin tones, with 52.9% (9/17) identifying as type V and 23.5% (4/17) as type VI. Middle Eastern participants (n=22) predominantly reported intermediate tones (type II: 5/22, 22.7%; type III: 11/22, 50.0%). These distributions align with established patterns between race and skin phototype and support the validity of the self-reported classification within this cohort.

Engagement metrics are summarized in Table 2. Among educational content, 24 out of 43 (55.8%) posts integrated multiple themes within a single post. Sunscreen use was the most frequently represented topic, appearing in 69.8% (30/43) of all educational posts. Educational content averaged 262.2 (493.6) views and 7 (13.3) likes per-post, compared with 214.1 (270.2) views and 5.4 (7.7) likes for outreach content. On average, 14.5% (26.5%) of viewers of educational posts were nonfollowers, indicating that each educational post reached approximately 38 new users beyond the account’s existing audience. The highest performing post was a reel showing photos of an on-campus sunscreen dispenser, personified by a facial filter with isolated eyes and lips. This was subsequently followed by photos of sun-damaged skin on the face and neck overlaying popular audio saying, “Nope, I’m good, thank you,” to encourage sunscreen use. This reel generated 2947 views (nonfollowers: 2720/2947, 92%) and received n=66 likes, substantially surpassing other engagement methods.

At baseline, 24.1% (55/230) of precampaign participants reported awareness of the university’s SSC initiative. After the campaign, postsurvey data revealed that 48.7% (130/267) of participants reported awareness of the SSC Instagram account, demonstrating a significant increase in visibility (χ²₁=32.5; P<.001). Among those who were aware, the majority (113/130, 86.9%) indicated that they followed the account. SSC Instagram awareness varied significantly by skin type: 56.7% (93/164) of participants with skin types I-II were aware of the SSC Instagram compared with 35.9% (37/103) of participants with types III-VI (χ²₁=10.9; P<.001). Participants who followed the SSC Instagram account were also substantially more likely to report sunscreen dispenser use (χ²₁=85.2; P<.001); the majority of followers (102/113, 90.3%) had used a dispenser.

Among those who indicated aided recall of specific themes from the SSC Instagram account (n=124), 539 total recall selections were recorded across 5 educational themes. Sunscreen use was the most frequently recalled theme (121/124, 97.6%), followed by protective clothing (111/124, 89.5%), tanning bed risks (106/124, 85.5%), skin cancer by skin tone (104/124, 83.9%), and winter sun safety (97/124, 78.2%). Sunscreen was also the most frequently posted theme (30/43, 69.7% of educational posts), followed by protective clothing (16/43, 37.2% of educational posts). Notably, recall patterns did not strictly mirror posting frequency. For example, tanning bed risks appeared in only 27.9% (12/43) of education-focused posts but were recalled by 85.5% (106/124) of participants, while skin cancer by skin tone appeared in 14% (6/43) of educational posts yet achieved 83.9% (104/124) recall. These results suggest that tanning bed risks and skin cancer by skin tone may have been especially salient themes among respondents who were aware of the SSC Instagram account. However, because recall was assessed using an aided theme list and only among respondents aware of the account, these findings should be interpreted as indicators of theme salience rather than as direct evidence of knowledge gain. Winter sun safety was the third most frequently posted educational theme (16/43, 37.2% of educational posts) and was less frequently recalled (97/124, 78.2%), suggesting limited resonance.

There were no demographic differences between those who did and did not follow the SSC Instagram account, with the exception of skin tone: followers were more likely to report lighter (types I-II) skin tones (χ²₁=10.9; P<.001). Respondents who reported following the social media account (113/267, 42.3%) also reported significantly higher sun safety behaviors compared to nonfollowers (Table 3). SSC Instagram followers reported greater sunscreen use (mean 4.1, SD 0.8 vs mean 3.3, SD 1.1; P<.001), more protective clothing use (mean 3.5, SD 0.8 vs mean 3.2, SD 1.0; P=.007), increased shade-seeking behaviors (mean 3.8, SD 0.8 vs mean 3.1, SD 1.1; P<.001), and more frequent UV index checking (mean 2.8, SD 0.8 vs mean 2.2, SD 1.2; P<.001). The composite sun safety behavior score was also significantly higher among followers than nonfollowers (mean 24.9, SD 4.5 vs mean 18.5, SD 4.7; P<.001).

In a multivariable logistic regression analysis adjusting for skin tone (odds ratio [OR] 2.33, 95% CI 1.19‐4.56; P<.001) and sunscreen dispenser use (OR 7.78, 95% CI 3.82‐15.84; P<.001), following the SSC Instagram account remained a strong independent factor associated with higher postcampaign sun safety behavior (Table 4). Participants who checked or followed the SSC Instagram account were over 6 times more likely to have a higher sun safety behavior composite score compared to nonfollowers (OR 6.81, 95% CI 3.41‐13.60; P<.001). This finding should be interpreted as an association rather than evidence of causal impact, as participants who were already more interested in sun safety may have been more likely to follow the SSC Instagram account.

Consistent with prior work demonstrating the central role of social media as a source of health information among young adults [2,3,36], the SSC Instagram achieved substantial visibility. Trend-based posts helped embed sun protection behaviors within campus culture, increase perceived social norms around sunscreen use, and foster peer-to-peer diffusion of knowledge through humor and familiarity with current digital trends. This creative approach aimed to normalize daily sunscreen use and UVR protective practices by aligning them with the aesthetic and cultural norms of the digital environment. Rather than viewing sun safety in isolation, the campaign leveraged young adults’ focus on appearance—such as by highlighting the aesthetic impact of sun damage—to reframe protective practices as culturally-relevant health behaviors.

The peer network dissemination strategy adequately leveraged trusted peer groups to boost message reach among young adults unlikely to encounter institutional channels. Campus organizations that reposted SSC Instagram content had a potential digital reach equivalent to roughly one-third of the student body. Additionally, Instagram analytics revealed that educational posts routinely reached Instagram users who did not follow the SSC account, suggesting that peer network dissemination effectively expanded exposure beyond the immediate audience. This pattern is notable given that campaigns relying solely on organic reach often struggle to penetrate beyond existing followers [38,39].

At the platform level, exposure among Instagram users who did not follow the SSC account remained a meaningful contributor to reach, with 14.5% (38/262.2) of total impressions generated by users not subscribed to the account, on average. Shares and comments were infrequent, consistent with prior young adult-focused health promotion research [38,39]. However, views and likes demonstrated consistent performance across themes. Together, these analytics indicate that the SSC Instagram campaign achieved broad algorithmic circulation and engagement.

The high performance of sunscreen-focused reels, especially those incorporating humor and trend-based formats, highlights the importance of aligning prevention messaging with the aesthetic and cultural norms of the young adult digital environment. This environment is uniquely characterized by identity exploration in public spaces, high social visibility and constant comparison, and blended online and offline personas. Moreover, it has been described as an algorithm-shaped experience, with participatory creativity and interactivity, and one that is influenced by rapid cultural cycles and community-seeking across real and digital borders [51]. Young adult health engagement on social media is also often shaped by influencer-driven norms and intuitive assessments of credibility rather than formal expertise [2]. These dynamics can amplify both positive and negative health influences, emphasizing the need for group-tailored, trend-aligned, and inclusive messaging. The SSC Instagram attempted to leverage these characteristics to increase campaign reach and appears to have successfully done so within a university campus environment.

Content recall patterns provide insight into the salience of SSC Instagram themes among respondents who were aware of the account. Because recall was assessed using a list, these findings should be interpreted as aided thematic recall rather than unaided memory for specific posts. Although sunscreen was the most frequently posted topic, high levels of aided recall were also observed for tanning bed risks and skin cancer by skin tone, which were posted less often but may have had strong salience for this audience. These findings suggest that message novelty, perceived personal relevance, and the counter-messaging nature of content (eg, correcting misconceptions about risk across skin tones) may exert greater influence on recall than posting frequency alone. This pattern may also reflect the comparatively low baseline knowledge observed for tanning bed risks and skin cancer susceptibility across skin tones in the precampaign survey, suggesting that participants may have been more likely to notice and remember content that addressed these existing knowledge gaps. Importantly, pre-post knowledge outcomes for the broader SSC initiative are reported elsewhere [41]; the present findings focus on social media–specific recall and engagement only. While direct comparative evidence evaluating message characteristics versus posting frequency on recall is limited, prior literature demonstrates that message tailoring, narrative framing, and counter-messaging can improve salience and resonance [2,3,27,52-54].

The low recall of winter sun safety content, despite being one of the more frequently posted themes, underscores limitations in seasonal messaging for UVR prevention. Young adults may underestimate winter UVR exposure, which is consistent with previous literature showing lower perceived risk during colder months [55,56]. These findings suggest that future campaigns may need to intensify or diversify winter messaging modalities (eg, in-person prompts, location-based mobile reminders) to overcome entrenched assumptions about seasonal risk.

Patterns of campaign awareness also reveal important disparities. Young adults with lighter skin tones were significantly more likely to be aware of the SSC Instagram account, consistent with evidence that individuals with darker skin tones often perceive themselves to be at lower risk for skin cancer and are less likely to seek UVR-related health information [57,58]. This gap has substantive equity implications: without tailored efforts to engage young adults across diverse skin tones, digital prevention strategies may inadvertently reinforce disparities in UVR protection behaviors. The strong recall of the “skin cancer by skin tone” theme suggests that inclusive, identity-relevant messaging is not only feasible but impactful and should be expanded in future iterations of the campaign.

The integration of digital messaging with environmental supports also appeared meaningful, specifically with the installation of seven sunscreen dispensers. Young adults who followed the SSC Instagram account and those who visited athletic centers were more likely to use campus sunscreen dispensers, illustrating how digital and built environments can mutually reinforce one another. Similar synergistic effects have been observed in other public health interventions, such as campus-based human papillomavirus or influenza vaccination campaigns that paired social media outreach with on-site clinics, resulting in increased vaccine uptake [59,60]. Further research is warranted to elucidate the value of integrating digital and physical components to maximize healthy behavior change. Still, this multicomponent approach aligns with ecological models of behavior change, which emphasize the interaction of personal, social, and environmental factors in shaping preventive health behaviors [61].

Several implications emerge from this evaluation. First, social media campaigns targeting young adults benefit substantially from high-quality tailoring and trend-aligned design, which increase relevance and engagement. Second, theme selection should not rely solely on frequency; topics that address misconceptions, highlight disparities, or provide counter-narratives may yield disproportionately strong recall. Third, equitable campaign impact requires intentional efforts to reach populations with historically lower UVR-related risk perception, including young adults with darker skin tones. Finally, pairing digital campaigns with accessible environmental resources, such as on-campus sunscreen dispensers, may enhance both awareness and behavioral uptake.

This study has several limitations that should be kept in mind when interpreting the findings. The anonymous, independent-samples design prevents linking participants across time and limits inferences about within-person change. Moreover, participant overlap cannot be determined. The nonexperimental design further constrains causal interpretation because exposure was not manipulated and participants were not randomly assigned to conditions; accordingly, findings should be interpreted as descriptive and associative. The observed association between Instagram account engagement and sun safety behaviors may also reflect reverse causality, such that individuals already more engaged in sun protection were more likely to seek out or attend to campaign content, and may be influenced by common method variance given that both exposure-related and behavior-related variables were self-reported, which can inflate observed associations. More broadly, self-reported survey data are subject to recall and social desirability bias. In addition, Instagram analytics provide aggregate rather than individual-level metrics, limiting the precision of linking digital exposure to behavioral outcomes, and are influenced by platform algorithms and privacy protections that shape how content is distributed and which users are reached; as a result, engagement indicators such as likes and views may not fully capture passive exposure or reflect the true extent of audience reach. The study was also conducted at a single urban university, which may limit generalizability to other campus environments or institutional settings, and Fitzpatrick skin type was collected only in the postcampaign survey. Thus, it was not possible to evaluate pre-post sample comparability or change by skin type.

Nonetheless, this study contributes an important perspective to the literature on digital UVR prevention strategies by demonstrating how social media can function as a high-reach, low-cost, and culturally embedded medium for public health messaging among young adults. As preventive medicine increasingly adapts to digital platforms, these findings highlight the value of targeted, inclusive, and visually engaging communication strategies that resonate with contemporary media habits while supporting equitable access to cancer-preventive behaviors.

Taken together, this social media–focused SSC evaluation illustrates the promise and ongoing challenges of delivering sun safety campaigns within the dynamic digital landscape that shapes young adult communication and identity. By aligning message design with platform norms, cultural aesthetics, and the interaction patterns that characterize young adult social media use, the SSC Instagram campaign achieved meaningful reach, strong aided thematic recall, and tangible associations with early behavioral indicators. At the same time, our findings underscore the need for continued attention to equity, seasonal risk perception, and the integration of digital and environmental supports in order to strengthen the impact of future iterations. As universities increasingly look to social platforms as core channels for health promotion, this research demonstrates how thoughtful, audience-centered design can translate public health goals into strategies that resonate within the fast-moving and socially mediated environments of young adults.