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A course wiki with tons of great resources on using social media in education, plus how-to and rubrics for many topics. Using and evaluating discussion forums with students

When you install AddThis on your site, your users have access to the most popular social networks and bookmarking destinations like Facebook, Twitter, Digg, and many more. New services are being added all the time, from international sites to helpful tools like translation and printing.

Resources/tutorlials for using Diigo social bookmarking tool. Some great ideas for educational uses.

An interesting tool for creating more diverse "Current Event" posts.