I've been having a blast hanging out on IRC talking with 7MS listeners and VulnHub users about pentesting and just about any other topic imaginable.
New to IRC?
If so, it's still pretty easy to get started. Just click here (famous last words, right? :-), pick a nickname, and choose to join the #7ms channel (I highly recommend the #vulnhub and #offsec channels as well).
Connecting using other clients
If you're a bit more experienced and want to connect with a regular GUI client you might wanna take a look at this article for a list of other methods/clients to connect to IRC from. Personally I'm a big fan of IRCloud which makes it easy-peasy to connect from desktop/mobile without missing a beat!