The number 1 feature of G+ I'd like is federation. Something like that would be immensely cool (and for Google, still very profitable) if it would work like ema

The number 1 feature of G+ I'd like is federation. Something like that would be immensely cool (and for Google, still very profitable) if it would work like email. If I could log in to the network with any vendor I like. Or run my own box that talks to the rest of them.