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Our bookmarks on this topic are also at pinboard.in/u:unison/t:social-bookmarking/
From anecdote: delicious.com is a free social book-marking web site which can help a group share useful links. Instead of one person relying on their own efforts to find relevant and useful information, with social book-marking you can distribute the effort among your group. Teams, communities and networks within and across organisations can make use of this simple and effective capability and enhance their collaboration practices.