Why would he even care? It's only in some confused fantasies that this project, of all projects, would be THE ONE to actually challenge Facebook. It might, it might not. No more likely Diaspora than some project cooked up by a pair of 16 year olds in Brazil.

Have you seen first versions of FB?

My guess is that it was a much bigger piece of crap. A PHP crap. And guess who wrote it? Harvard undergrads. ^_^