try nimbuzz it works with all of the messenger clients that you can think off. It works great on the mogul. Facebook, myspace im, aim, yahoo, msn messenger, icq, jabber, google talk, and a few more that i can't think of right now. Its 100% free app and has some cool features such as the ability to post widgets to myspace and other sites to let users buzz your phone or chat with you, right from the widget.
www.nimbuzz.com