But when I heard of the YC/Facebook stuff it struck me immediately as a bad idea. It feels like a shift towards lock in. It's encouraging startups to build on a specific platform rather than supporting more open standards.
It also feels a lot like the idea that YC is aiming for the social "Facebook app" space; which, I agree, is a great (and fast) money spinner, but it's hardly revolutionary :)
Just my 2p.