Google+ Is an Identity Layer

Ignore the social networking element and just use it as a common way to identify yourself across Google.

Realistically, Google+ (which could have been announced as more features for your existing account) is going to be even more heavily-integrated across Google in areas such as contacts (it would make sense to have circles as your way of organising contacts, rather than two separate systems within Google) and anything involving sharing. Personally, I love the Google-wide notification system that's tied to Plus.

I realise that a similar thing has recently been posted and I apologise for the similar message. I just felt like I could put it more succinctly.