User blog comment:Dopp/Technical Update: May 17, 2011/@comment-3104099-20110523043706/@comment-1393830-20110523203716

As Moncho said, chat, if it ever gets its bugs fixed, will be mostly used by new users. IRC is where you will find the more advanced users. IRC also has much more functionality than chat. The IRC interface is also highly dependent on the client you use.