In order to make MB experience a bit more social, I think it would be interesting to allow users to add more personal information on their profile.

That way, rather than just discussing (via edit note) to a nickname, you could also know that this person comes from the same country as you, is older and has a loving avatar
As a comparison, these pieces of information are also those available e.g. on lastfm.

This would add a bit more fun in our austere user interface, and may attract/retain more editors and voters.