OK, the big problem with social media - which I think everyone recognizes - is that it allows you to attack or insult people with impunity. it unleashes our worst nature. We can get away with saying things to people we would never say to their face, or even on the phone, and we can do it across great distances.
SO... imagine in the future, after a societal collapse - with our current technology inoperative and no rule of law - people seek out and exact revenge on others who attacked them and lambasted them on the internet years earlier.
"Revenge of the Internet" would make a darkly-humorous anthology of short stories, don't you think?