People who do this have personal problems that they don't even realize. Being a general pain in the arse is all the know to alleviate what ails them. Alts are one thing that has me feeling more selective about who I count as a friend. I have had a couple who were posing as a friend to me but trolling me from an alt account. They give themselves away without meaning to trying to juggle the accounts in comments. You would think grown adults could do better.