When you write a response to someone's comment on Facebook (or other social media) but before hitting reply, you stop and delete it because you realize that by posting your response you're about to engage in a painful online conversation that you'll only regret. It's as if future regret went back in time to the present to warn you. Inspired by Marty McFly from Back To The Future.

Internet persona(s) who happens to follow you and you happen to follow them back and maintain communication with and have a mutual liking for eachother whether it be friendship wise, etc. (Mutuals if more than one mutual)