That's not anti-social bookmarking. This is anti-social bookmarking: http://sm.purepistos.net/about

I went from browser bookmarks, to Delicious, to exploring (Magnolia, Simpy, etc.), to Diigo, to Selfmarks. A couple hundred bookmarks later, I haven't looked back; it's all I need.

Functional, usable demo at http://sm-demo.purepistos.net/ .