I have had five responses to an anonymous1 Blackboard post about the possibility of using twitter.
One response said that it was a good idea.
However, all of them responded on various shades of, "Helllllll noooo." Actual stated reasons so far vary from, "I think Blackboard works just fine," to "I don't want to check something else," to "It's blocked from my phone."
I'll keep you updated if more responses come in.
1: Anonymous, as in the thread group is marked, "Questions from your teacher," but the setting is set to keep the poster's identity anonymous. Even from me. So while I am curious to know about our "Helllllll noooo" poster, I am left in the dark.