I was asked for a quote today to comment on F8 developments and the continuing apparent "centralization" of identity on that platform. It is not new for me to say these things but perhaps more crystallized.....
The turning point of the web becoming more social was mentioned several times today.
The issue at hand is fundamentally about FREEDOM: the freedom to choose who hosts your identity online (with the freedom to set up and host your own), the freedom to choose your persona - how you present yourself, what your gender is, your age, your race, your sex, where you are in the world. A prime example of WHY these freedoms are vital is the story of James Chartrand - you can read for yourself her story of being a "him" online as a single mother seeking work as a copy editor. Having a male identity was the way she succeeded.
We did a whole session at She's Geeky the women's technology unconference about women, identity and privacy online. ALL the women in that session had between 3-5 personas for different aspects of life and purposes. Many of those personas were 'ungendered' or male. I have not talked to many people of color about their online lives and persona management but should. I imagine that like women they choose for some of their persona not to identify racially.
Your "friends" shouldn't be locked into a particular commercial context. This is where the work on client-side applications for identity management and social coordination for individuals are key. The browser was never designed to do these kinds of functions and I don't think trying to make it do them is wise.
We need open "friend" standards where people are autonomous, without their identity tied to a commercial silo - like Google, Yahoo, Facebook, Microsoft, AOL, or any company. This is a vision of a web where I can "peer friend" my friends, and then no entity has power over our relationship. This requires people to be first-class objects on the web. Not easy to do, but essential for us to figure out.
Related posts:
andersphone on 
Unconference.net
Kaliya,
I am not quite sure if I understand the last paragraph. Don't you need a platform to build the Social Graph?
Saqib