Social for sure, guessing so/sp, although I also relate to the so/sx description. Main thing, though- I watched the Stephen Fry youtube clip on blackcat's enneagram link and holy crap do we have the same demeanor- by this I mean, always averting the eyes, but making sure to make eye contact occasionally. Seeming very reserved and cautious and dare I say, somewhat regal, but still, wanting to talk. But not wanting to reveal too much.
No wonder I've always LOVED the guy. (I know I may not seem like this online, but in person with strangers or if I'm on the spot, very very much so.)
EDIT: I'd say I'm more likely sx/so or so/sx.