“…Cross-sectional survey techniques have illuminated social, psychological, and physical barriers to increased undergraduate vaccination. 8,10,13,15,17,23,24 However, few published studies have probed the effectiveness of various interventions on collegiate vaccination rates, 9,11,12,18,19,25 and of those even fewer have used participant vaccination outcome as the variable of interest. 9,11,18,19 Concurrently, there has been a surge in the presence of social networking services (SNS), with utilization increasing from 36% of US adults in 2009 to 72% in 2019 (70% to 90% utilization in college-aged Americans).…”