I'm primarily a single-player gamer, too, but I'm also the only one of my friends who has a PS3 and not an Xbox, and it gets a little lonely when I go to talk about a game and no one else has even heard of it. PC MMOs have been getting a lot of my attention lately because it's more social (

) and I can talk about it to my friends later without their eyes glazing over in disinterest.
Haha, it's a comfort when the only person you've spoken to all day is the maintenance man as he's scolding you for breaking your garbage disposal (apparently if you don't turn it on for a month, it rusts. But I just don't have all that much to grind up, sheesh!)