Twitter can't really be compared to any other kind of discussion because we are engaging in a completely different kind of discussion. It's great for sharing quick ideas and getting quick feedback but there is a lot lost in 140 characters that wouldn't be in an unlimited amount that we find in blackboard. But because of it's interface the ideas are free flowing, in real time and have the illusion of immersion.
Blackboard on the other hand provides users with unlimited amount of text to share but has a rather poor interface that doesn't make it easy to ideas rapidly send media easily. These all pale in comparison to in class discussion... But only if it's done correctly and makes use of the new media mentioned and everyone contributes (which is easier to do online)
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