Google+ does all this and more. How I wish Google hadn't tied the name to the youtube cleanup / real name policy.
My opinion is that real names policies mostly should die. Basically the idea that real names will cause people to behave is a fallacy for a number of reasons:
1. Trolls use fake accounts
2. Some people seems to honestly believe that "just nuke Iran/Syria/Israel/Gaza" is a smart comment
3. or they don't care about the consequences of posting dumb stuff.
The only people you stop with real names policies are those with dissenting opinions, who don't make fake accounts and who feel they have something to lose.
