How about reading this
http://incsub.org/blog/2005/the-new-resource-social-bookmarks-tagging-or-something-else (2005)
From http://www.simpy.com/:
What is Simpy?
Simpy is a social bookmarking service that lets you save, tag and search your own bookmarks and notes or browse and search other users’ links and tags. You can be open and share your links with others, or keep them private. Simpy also helps you find like-minded people, discover new and interesting sites, publish your bookmarks, detect and eliminate link-rot, etc.
Library podcasts:
