Many of us hang out in the IRC channel #texasxtremerpg on freenode.net. IRC stands for (I)nternet (R)elay (C)hat. It's an old-school way to chat online and is completely free. Another great channel for RPG fans is #D&D on freenode.net as well.
You can either connect with an IRC client of your choice; or, you can use this handy webchat link if you are new to IRC and just want to take it for a test drive. Hexchat is a good client for someone new to IRC and is available for Linux, OSX, and Windows.