The Venn of Social

One of my heroes, as an undergraduate, was John Venn.  He studied
mathematics at my college, there was a big stain glass window honoring him
overlooking our dining area.

Given the increasing number of protocols in recent times I thought it might
be an idea to make a kind of visual representation, "The Venn of Social",
partly also inspired by kaliya's venn of identity.

http://www.w3.org/community/rww/wiki/images/9/94/Vennofsocial.png

I think there's two main world view in the social web.

1. Email style Identifiers
2. HTTP style Identifiers

And I've tried to put some ideas at the intersection, in particular the
read write web, and michiel's promising 'polyglot' approach of
useraddress.net

I've tried to be representative of the more modern initiatives, please let
me know if there's anything you feel that it would be useful to add