Why would some people use their other accounts to comment on their own posts and chat as if those are differnet people?

[c=#BF0080]Lmao!! I've seen it quite a few times.. as if it isn't obvious. 😂 I always like when they forget what account they're on and post as the wrong person. 😂😂 Chestboy/bikinigirl is just one example. 😂[/c]