Sexual victimization is a major public health concern with significant consequences for survivors, their families, and society at large. Studies examining in-person disclosure of sexual victimization suggest that the way others respond to disclosure has a significant impact on survivors’ well-being. With the advent of social media, more survivors are choosing to disclose their experience online. Research is needed to understand how social reactions to online disclosure of sexual victimization impact survivors. Accordingly, the current study examined the association between online social reactions to the disclosure of sexual victimization and symptoms of post-traumatic stress disorder (PTSD) symptoms in a sample of 195 individuals who disclosed their experience online via the hashtag #MeToo. Symptoms of PTSD were positively associated with the level of assault severity reported by the survivor, as well as receipt of online social reactions to disclosure via #MeToo that made fun, insulted, or said something to hurt the survivor. Online social reactions to disclosure via #MeToo that involved turning away from the survivor or providing unsupportive acknowledgment of the experience were unrelated with PTSD symptoms. PTSD symptoms were also not associated with the receipt of positive online social reactions to disclosure via #MeToo. Like research addressing in-person social reactions to disclosure of sexual victimization, some forms of online negative social reactions to disclosure of sexual victimization via #MeToo appear to be associated with worse psychological outcomes among survivors. Thus, online disclosure of sexual victimization and its impact needs to be attended to in clinical and research settings.