If you browse through github's blog you can easily see what happened the last few months:

* github managed to hire & acquihire top talent like crazy

* their UI/UX people really focused on making github's UI more consistent and usable

* they spent time to go native

* the enterprise solution got a lot of love

so they have huge momentum and spend their time very well. personally I think they should look into making jobs.github.com THE resource to hire great talent. In a way github already is very relevant in the hiring process but similar to carreers.stackoverflow there is huge untapped opportunity to disrupt the hiring market.

Anyway I think github has a bright future ahead and I'm very curious about what will happen in the coming months.