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First, the option to look up people in different ways such as their real name, user name or how they tagged something allows for better networking.  I also am very impressed with the idea of lists.  Although, I am still trying to figure out how to implement them, I am excited that this would be a great tool for the classroom use for research and or sharing.  In addition, I have just spent hours trying to figure out the snapshot feature.  I think I will break down and watch a tutorial.  However, I truly like to try to figure things out on my own. It seems to me I am just hitting the surface of Diigo.  Delicious does not seem to have as many bells and whistles.

I have always liked Social Bookmarking.  I wish we could get more teachers to network and therefore share tags.  If you had a set of tags that were standard, you could easily create websites that coincided with curriculum, standards and which time of year they were for.   Social Bookmarking is a great way to collaborate and find some great treasures.