Facebook, Twitter, and Instagram.

I don't like any of these very much. One reason is because almost anyone can say stuff about you and your friends. If I had to choose one of these as a favorite it would be Facebook because the games are almost all online games that you can play with your friends. Twitter is a little pointless to me because you just talk to people and that's what Skype is for. I have no idea what instagram is so I'd count that as my least favorite.