Within the current study, we examined themes of college students’ reasons for choosing not to formally disclose (report) sexual assault. To complete this objective, we examined tweets ( n = 1,297) that used the WhyIDidntReport hashtag in which a user also made reference (within the same thread) to being enrolled at a college or university during the time (and aftermath) of the assault. We deemed Twitter a particularly valuable platform, offering insight into the hidden figure of crime, as users described events, feelings, and perceptions after the event that led to them not formally disclosing. Further, it provides a large sample of cases of women and men who recognize their assault as an assault (at least in hindsight), while also providing open-ended, unstructured explanations of their rationales and motivations. Using an inductive approach, we established broad themes that were then refocused into common barriers of formal disclosure or the continuation of formal disclosure. Subthemes included anticipated social reactions (stemming from vicarious and direct experiences), internalized emotions, often stemming from social reactions (normalization, shame, and blame), victim and offender status, and victim-offender relationship. Three overarching premises were developed from the analysis including (a) victims’ internalizations of experiences and observations, (b) the interaction of social factors of the victim, offender, and the victim-offender relationship, and (c) the continual and compounded decision-making process of formal disclosure. These conclusions were then examined within theoretical models, including Black’s Behavior of Law Theory (specifically morphology and stratification), Overstreet and Quinn’s intimate partner violence stigmatization model, and Chaudoir and Fisher’s disclosure process model. Lastly, we provide programmatic recommendations, which includes retailoring current bystander intervention curricula to include more focus on social reactions and social support in anticipation of college students being recipients of sexual assault disclosures by friends and acquaintances.