by far the largest chatroom for forex traders exists on the internet relay chat (IRC) server known as irc.financialchat.com

connection to this server is free, and IRC clients can be downloaded from many locations (the most popular by far is mIRC http://www.mirc.co.uk)

channel #forex is where forex traders hang out, with peak market hours having 50-80 people.

this is also the same network where the largest active stock trading channels exist (#activetrader) etc.

these are the spots the professionals trade at.. none of this WWW web chat rooms.