They don't have to reinvent any federated protocol; such a protocol already exists. See http://matrix.org http://matrix.org It would be really cool if google

They don't have to reinvent any federated protocol; such a protocol already exists. See http://matrix.org http://matrix.org It would be really cool if google creates products that leverages the matrix protocol. I mean, gmail leverages email, smtp, etc....why not build a platform that leverages matrix?