The Wonderful World of Social Networking Tools
by Cem Basman
Galore! Here is a link list with reviews of current social bookmarks, social bookmark managers, semi-public social bookmarks, search-engines with bookmarking, public bookmarks, listing and cataloging, social communities, annotation services, Ajax personal start pages, specialized bookmarking, and diverse tools ... and more. Music, video and maps bookmarking is even not included in this list.
You can't escape that social thing anymore. It's inflationary. For every social networking problem you've got a billion overlapping solutions. There is no end in sight.