My Web 2.0

Just came across this via Flickr (“Shiny New Toy“): Yahoo Search My Web 2.0 Beta. See also the obligatory product blog and developer APIs.
Combines social networking and search to limit your search results based on trust metrics. I’ve not been able to get very far into the site yet to try it out. At first pass it looks like its relying on your cached (you can save pages from the web) and tagged pages to seed the recommendations to others. Also looks like your social network is limited to others with Yahoo accounts. Which is a limited view of my social network.
Read more on Many-to-Many.
I’d probably say that “Act III”, to borrow Mayfield’s term, would be letting go of the ownership of the social network. Just let me import or point to contacts, various tagging systems, etc. Use the FOAF.