Less Wrong IRC Chatroom
Less Wrong's IRC chatroom is the #lesswrong channel on the FreeNode IRC server.
You can access the channel via web interface if you don't want to set up an IRC client. Just enter your nickname in the form.
Please read the list of chatroom rules before joining.
There is also a slack channel as at 2015-09-04. Information can be found here Less_Wrong_Slack
(Note that this isn't an official channel. Actually, my experience tends to indicate that having a regular IRC channel might well be Considered Harmful in terms of how much of the reader's life force it will suck out.) --Eliezer Yudkowsky 02:56, 11 February 2010 (UTC))