I went in a number of times and it was fun, I had in NSF for a while too, but slowly people stopped using it. It might still be there, I don't even know.
It can be good, sometimes people can talk more openly when it's not going to stay for all to see, which is good and bad. Some of the chats would have been good for others to read, and discuss, but then certain things would never have been said.
But as I mentioned, people can get me on various chat thingies, yahoo, gmail, Skype, I'm sure someone could set up a chat group in one of these kinda program's and make a APF group, or make an indecent one of your own. Chat away. The chat here and at NSF I did have some problems with and often had to force quite and reload etc. but is probably some software update I never bothered with.