Twitter discussion: we can tweet messages to the pubic. Followers will see it. They can leave comments. If we want to refer to somebody, we need to use "@" somebody's name. We can "@" anybody's name.We can also limit the persons who can't or can see our messages. However, we can only post 140 characters at a time.
Blackboard discussion: If we need to post texts, we need to create threads and write titles for the texts. Then we can compose texts. When we want to read others' texts, we can click in the titles. After reading them, we can just leave messages under the texts but only to the authors.In addition, there is no word limit.
In-class discussion: We need to have a place to sit down to meet each other. In-class discussion has the limit of locations, time and the number of people. Who attend the discussion need to have the same schedule. Too many people in a discussion group may not work. On Twitter and Blackboard, we can read texts and leave messages anytime and anywhere. However, if we have a face-to-face talk with each other, we can get somebody's ideas more directly and immediately.
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