A Blackboard discussion is very different from a Twitter discussion. On Twitter, a tweet is limited to only 140 characters whereas Blackboard is unlimited. Also, on Blackboard, only those who are in your course section can see what you have posted while a tweet is open to anyone with internet access. There are constant notifications whenever someone replies or retweets on Twitter and there is also a mobile app. BlackBoard updates are usually sent through an e-mail which is a lot less convenient for most users.
In-class discussions are also pretty different from Twitter discussions. In a in-class discussion, there isn't much time to think about what you want to say. On Twitter, you can reply whenever you feel and can also delete your tweet. If you say something in-class, there is undoing. An obvious difference is the fact that Twitter is online and in-class discussions are face to face. Like I previously stated, tweets can be seen by anyone and anyone can respond, whereas in-class discussions are limited to those in the room.
Did you mean that in in-class discussions there is no undoing? Also, tweets can be private, which would not allow anyone to see or respond. I do agree with you though that in-class discussions don't give you enough time to think at times, which can get a person stumped in their argument.
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