Diigo is a free social bookmarking, researching, and knowledge sharing tool that was created to mimic the ease of taking notes while providing a network for sharing and discovering information. Diigo allows you to take personal notes and highlight text information on web pages just as you would a piece of paper. You can then bookmark and save this information for further review, while adding tags to keep everything organize. You can share this information with colleagues and friends, allowing them to access the web page, view your notes, and add their own annotations (Manolovitz). Read more about the Diigo features at: What is Diigo.
Check out my Diigo
*Check the My Favorite Resource page for the direct reference.