So, after having the blocking filter fixed at our school, I was finally able to try Tweeting with my students. I attempted it with my smallest class, Geometry. I had a few students that said they preferred to not tweet, and I informed them that I respected their choice. Out of (now) 15 students, I had 6 actively engaged in the tweeting activity. I found out shortly after that a few students were only pretending to tweet along with me, and three others spent this time just setting up a twitter account.
On a very slightly related note, yesterday I had my 9th Graders develop their own behavior rules and consequences for computer lab days, and they were the most on task they have ever been. Thank you LeAnn Nutter for that idea!
Before I try tweeting with my Geometry class, I will probably have this same discussion with them about rules and see if that helps. If any reader has a suggestion, please let me know!