Not exactly the same thing, but I was often wondering how disparate sets of people I knew got to be 'friends' with each other on facebook. The answer turned out to be Mafia Wars, not anything small-worldish in real life. But it was very perplexing for a while.
And now I'm wondering who's the person I knew who knew someone who knew someone else who knew someone else who knew Ghoulish Delight.
