I completely understand about the "need to socialize more". I just joined Google+ and I'm loving it so far. It's available by invite only at the moment as it is still in the testing phase. Anyway, I recommend checking Google+ out as a new way to socialize. It's working for me :-)
I don't think Google+ really counts as a club, does it? Forums are more club-like than Google+ is. Anyway, I've decided to join a local video game club I found out about. Haven't been to a meeting yet but I hope it'll be fun.
I'm a member of SELOC, a car club. While there is a big internet forum and wiki, we also have local meets and organised events. The club has raised a fair bit for charity with auctions, and the online wiki and knowledge base has saved many members a small fortune with DIY advice and other tips.
I'll be out with them on the airfield next Friday, doing some more of this: