John Mahowald - 2007-08-19

Mugshot (http://mugshot.org) is Red Hat's meta social networking site, which can aggregate lots of your online data, including:

iTunes, Last.fm, Rhapsody, and Yahoo! Music playlists   
Blogger, LiveJournal, MySpace, and more blogs   
Flickr and Picasa photos
Stories rated on Digg and Reddit
YouTube videos
Google reader shared items
del.icio.us bookmarks
Twitter status updates
Netflix movie queue
Facebook messages, photos, pokes, and wall messages
Amazon reviews and wish list items
RSS feeds

http://mugshot.org/features

Some of these may be good candidates, and mugshot already implements all of them to some extent.