This only works for some game types and with that, they become their own social eco-system. To limit and curtail that to the realms of social network first wou

This only works for some game types and with that, they become their own social eco-system. To limit and curtail that to the realms of social network first would only see a raft of disparious networks being game developer driven. With respective and their own flavour of what is and what isn't allowed in their social world, laying down the law. But then the whole social network model is still not perfect, so to enforce an imperfect model and way of interacting upon games would be an api too far for many games and curtail creativity. Also look at what games people play on social networks - #1 trolling - enough said.