Colin Meek tipped me off to Twine.com. In Colin's words, it's:
a new social bookmarking site underpinned with semantic technology. For journalists it is Facebook on steroids.
Through Twine you can join groups (called Twines) where people post interesting links, bookmarks and resources on specific topics as diverse as the 'Financial Crisis' and 'Beer'. Based on your activity and items you have bookmarked, the site 'recommends' twines, connections with other members and other items people have saved.
This site is crucial to the development of Sean's and my new movie.