Twitter discussion: is short and brief, it’s limited to 140 characters per tweet. It’s pretty similar to a conversation between people. You can easily and rapidly to create another tweet. The discussion can be directly set toward a specific person or group, simply using the symbol @. It can be set up for public or private.
Blackboard discussion: has enough space to write anything you want, not limit on words. It’s used mostly in schools. It’s pretty much like the email. A title or subject should be created, so people who read it have an idea of what the discussion is about. Anyone within the group can read and post the comments.
In class discussion: is the traditional way to discuss an issue. It may not be so great, that you can say anything you want, but the time is limited. Not everyone within the class has a chance to speak, or someone may not fully finish his/her thought.
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