thread manipulator

One who deletes their own obnoxious comments in a contentious Facebook thread to make another person who reacted to them look like a fool.

Chad: Myra has lost her mind. Did you see her talking to herself last night on Trip’s post about penguins’ rights?

Vic: Nah, I was there earlier. Martin said some bad stuff to her and they went back and forth a few times and then he deleted his own comments.

Chad: He does that all the time. He’s a thread manipulator.