Should Diaspora apply to Y Combinator? At present Diaspora has over $175K pledged on Kikcstarter so, clearly, they don't need the money. That said, I believe they would benefit significantly from the advice and community that Y Combinator has to offer.
I'd like to see Diaspora succeed, but I worry that the guys doing it seem smart but also a little green. Would Y Combinator help them find more mature developers, and, in particular, security and cryptography experts to help round out the team?
They are in a dangerous position. They have a large number of people who like them in a vague way-- who like not what they've built, but the general idea of what they plan to build. In a startup you want the exact opposite: you want a small number of people who like you a lot, not a large number who like you slightly.