Oh my goodness. My life began anew when I found this site. More work of mine has gone incomplete because of this website than any other reason except for probably the second example listed below. The premise is you fill out a profile, with the most important part being a checklist of your interests. Next, click on the Stumble button and you'll be directed to a page that fits under your listed interests. Not only that, but you can connect with friends online and directly share pages that they've "stumbled upon" with you. Very cool, very fun, and ridiculously easy to waste time on. Although it's not a traditional social networking site, by the strictest definition, it definitely qualifies as one.
Bear with me on this one, folks. Get all the nerd jokes out now. But in playing the game Madden 11, I have met over 300 PSN users and had some interaction online with approximately a quarter of them. Most of the time it's nothing more than trash talk, (if you think you can take me down, hit me up: PSN: xNotThatGoodx) but sometimes it turns into more than that. Offensive strategy discussion, real life NFL debates, even other games can become the topic of conversation. Although it is still relatively fledgeling in its maturity, voice chat and other innovations have taken PSN a long way as a legitimate form of "new new media".
So even though it's not Facebook specifically, I'm not quite under a rock as far as the Internet goes. Not having pictures or anything like that up of myself online prevents me from having to trust myself to be the camera police at any social gatherings or anything else of the sort. Every online interaction is headed towards qualification as social media, and there's nowhere to hide from it.