Social Media Hitman
A person who you request a nonliteral "hit" from, in which the hitman/hitwoman goes on a person's social media and bullies them, hurts them, just because the requesting party doesn't like them or the victim has hurt them. Social media hitmen can also go after people with no request. If you have social media you should watch what you do in real life and post because these people are always on the prowl. They will catfish to be somebody they are not, or make a spam account such as "39389383983403943" and various other names.
Given the circumstances, John sent a social media hitman after me. They were sure bad for me to figure out who it was from.