Eric Schmidt:
The people who built the Internet did not get a stable
version of identity; You need identity, in the sense that
you are a person, this is who you are these are your
friends and so on … The issue on the Internet is not the
lack of Facebook, the issue on the Internet is the lack
of identity.
(from http://techcrunch.com/2011/07/09/eric-schmidt-on-gauging-goo... )See also http://www.blindfiveyearold.com/how-to-implement-rel-author .