How does a twitter discussion compare to a blackboard discussion?
First, a blackboard post is not as limited in length as twitter posts (no more than 140 symbols).
In sense, this would make the twitter discussion faster and more erratic. Second, the blackboard discussion is easier to follow in terms of comment and response, because the replies are distinguished from the main posts. Therefore, Blackboard doesn't have the news feed appearance of Twitter.
How does a twitter discussion compare to an in-class discussion?
In a sense a twitter discussion is similar to an in-class discussion because there are many quick replies/posts rather than long, well-thought ones. And as in in-class discussion, often there is no order of post and reply. The replier has to indicate who's comment they refer to, and if it's too far away in time they may have to repeat some of the comment in their reply.
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