What is interesting, is that you can tag people friends or foes. When you friend someone, suddenly you can see icons appear on other accounts: friends-of-friend

What is interesting, is that you can tag people friends or foes. When you friend someone, suddenly you can see icons appear on other accounts: friends-of-friend (green/red pill), and foes-of-friend (green/green pill). I never got the impression that the tagging system is widely used, however.