Google+ Account linking

Seeing as most(all?) android phones use the Google account system for the play store, YouTube, etc. It would make sense to have a Google+ account linking system and make the whole linking system easier and more options make it available/appealing to wider group of people.

I do like this suggestion, as it probabaly is the only other sign in used so widely as Facebook.
I don't know how complicated it would be to implement, but a lot of people have stopped using Facebook as much as before.