Well, I have seen a chatbox in the top page in a few forums. I find them really interesting and fun. Members can quickly and casually post anything they like in the chatbox. It is a way to let out steam and also to greet our fellow members there.
Being honest, I dislike those chats. I think that it's a bit annoying when everyone is typing there, thanks God in this chatbox I see only a few messages. I mean, I like to talk to people, but it's only nice to talk once in a while.