There are many comparisons between discussions through twitter, blackboard, or an in class discussion. One of the comparisons is that everybody is able to partake in the discussion if they so choose. Although a contrast is that the teacher cannot pick on any one student to answer a question on twitter or blackboard. Another comparison is that one person usually starts the conversation and you can have a back and forth conversation or the conversation can split into different sub groups. A comparison between blackboard and twitter discussions is that there is a sense of anonymity as you have never met this person face to face unless you actually set up a meeting or have a prior experience with this person.
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