Twitter discussion allows users to post their thoughts in words with 140 bytes limit. Because of this limitation, it requires multiple tweets to express one's ideas.
Blackboard discussion don't have words limit, students can express their ideas more clearly. Yet Blackboard is used in certain purposes or tasks; moreover, there's an issue of time matter. Response may be delayed sometimes.
In class discussion occurs only when students and teachers speak to each other. Twitter discussion cannot be in class discussion, but class participation. Also, answering common questions is not considered in class discussion. Debate and group meeting are more likely to be class discussion.
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