Okay real answer: we don't know. Chatters log off and then never log back on. Chatters get lives, get married, get busy, die. It's the way chat is. We don't know what happens to users when they suddenly stop chatting for long periods. New users come on every day and replace old users. Old chatters return after long periods. The answer is: we have no idea. Sorry that's a crappy answer. But that's just the way chat is.