Happy Leap Year Day Stuart!
Much like you, I don't fit in to any of the categories in that list of social networking "personalities" which you read out. If there was a category for "been there, done that, and closed my facebook account" then I'd fit in to that one. I had almost no use for it, still don't, and I'm much happier without the endless bunch of useless emails and notifications I used to receive from Facebook.
Enjoy the last few hours of leap year day…you won't get another chance for 1461 days.