I signed up for a LinkedIn account a while ago. I can’t remember how it happened. I know it wasn’t because all the cool kids were doing it. Maybe I did it just in case it turned into something big, and then I’d already be registered. Anyways, I never use it, but I periodically get ‘acquaintance’ requests (there’s nothing fun or friendly about them; the lame default message that everyone uses is something like “I would like to establish a connection with you”) from people I know in person, and occasionally from people I’ve never met.