I wanted to put in a quick plug for the State Bar of Texas' Texas Bar Circle, which is a secure online social and professional network exclusively for licensed Texas attorneys. It's free for (and limited to) State Bar of Texas members. Those of you that are familiar with social networking websites will already be familiar with the concept (I wasn't, I confess), but Texas is the first state bar association to create such a network. (We also sponsor YouTube contests on the civil justice system and other un-state bar association like things like that). I haven't seen any groups devoted to federal practice or patent litigation (or troll-bashing) but I'm sure they'll be up soon.
Texas lawyers can register at Texas Bar Circle.