The WoW Livejournal communities are really some of the best citizens in the WoW community at large -- they always have interesting discussions and insights going on over there, and if you ever need a question answered or just want an opinion on something in-game, they're always ready with some insight. That's why I think this WoW Friending meme that spirdirslayer has going on is such a good idea -- basically, if you're over on Livejournal and are looking to meet a few players on your realm, you can head over to the page, find your server, and then enter your information along with a few survey questions and check out who else is playing with you in-game.
I almost wish Blizzard did more social networking stuff like this -- through the Armory, we can find out everything we need to know about each others' characters these days, but there's not much we can learn about the people behind those characters. Our own profiles here on WoW.com help with some of that as well, but it would be nice to have it all integrated in the game somehow: examine a character and find out that their player is living in the same town you are. Completely optional, of course -- not everyone wants to socialize to that extent. But for those interested, it seems like it would be a lot of fun.