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Upload pictures, slides, and add pulling live tweets or blog feeds, inserting an interactive map, adding audio notes or simply streaming videos Embed into website, share with social networking, is viewable on all size screens (including smart phones)

I don't know if I would call them online education tools or collaboration and sharing tools. But note that Diigo is on the list!

Alternative to class notebooks

The backchannel is everything going on in the room that isn't coming from the instructor. The backchannel is where people ask each other questions, pass notes, get distracted, and give you the most immediate feedback you'll ever get. Instead of ignoring the backchannel, TodaysMeet helps you leverage its power by bringing in the backchannel through tweets from Twitter.