I just searched for "google-facebook" and "identity management" and saw a blog by the title "Google-Facebook: Identity Management in a Brave New Internet"

Link: http://blogs.oracle.com/clayton/2008/05/googlefacebook_ident...

But, don't know if Clayton Donley is on HN or not..

His Bio, at Oracle:

Clayton Donley, Sr. Director, Development

Currently run the dev organization for some of Oracle's security and identity management products. Landed here after selling OctetString in 2005. Before that held various roles at IBM, Motorola, and as an independent consultant. Also wrote LDAP Programming in 2001.