Discussions on Blackboard, Twitter, and in class can have its pros and cons. One might think they aren't that different from each other but that isn't the case. For starter, an in-class discussion gives both students and professor a better chance at understanding what is being discussed/ask since there can be things like follow up questions for further clarification. Questions are also answered faster in an in-class discussion. One con of in-class discussions however, is that it can be more pressuring to respond directly to questions in person since you can't spend a lot of time thinking about an answer whereas online, you can.
On the other hand, blackboard discussions allow us more time to think about what we want to say and gives us a chance to edit/delete our errors. Blackboard has no word limit, which means we are allowed to write to our desired length. However, this means people would have to read through a long discussion until they can fully grasp the main idea of the post.
Twitter has a word limit, which allows for a more concise and straightforward discussion/answer. This helps people get a firm understanding of the post right away.
Bottom line, using either of these three methods to have a discussion is great, but one might be more suitable than the other depending on what message is being conveyed/discussed and how fast you want responds.
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