The big distinction that a google social network has is that its internal messaging system is real e-mail. Facebook relies on e-mail to keep users updated if th

The big distinction that a google social network has is that its internal messaging system is real e-mail. Facebook relies on e-mail to keep users updated if they don't log in. This means that social networking can be tied directly into your usual workflow, rather than being a separate site that you visit. This change alone is a huge competitive advantage.