It's not at all clear that having exactly the same content on G+ as on Facebook is a winning strategy for Google. The twitter-clones tried this approach, encou

It's not at all clear that having exactly the same content on G+ as on Facebook is a winning strategy for Google. The twitter-clones tried this approach, encouraging content-"seeding" with a full r/w API. What actually happened is that they (nearly?) all ended up as networks full of bots spamming each other with duplicate content. And it's hard to sell advertising when your only users are robots.