[kneisley]

I suggested Parse because I'm personally using it right now, so I know it well. That's obviously a bias, so take it as such. Firebase looks very similar. If you are going to lean on the greater community, Parse seems slightly better, because of the fact its a fork of Backbone-more people should understand pretty easily what's up with models.

Also, Parse is owned by Facebook and has pretty solid, simple login and integration with social sites.