I have been using twitter all semester to connect with my students outside of the classroom, but also as a way to contact them if I have a substitute for the day. I just made a separate account for purely classroom purposes, that way I don't have to use my personal account which I use for connecting with friends. I also made a Today's Meet classroom response board in order to discuss topics covered in class or their textbooks. Here is an example of one I may use in the future. http://todaysmeet.com/MrNeals4thper
This tool will be excellent for those students that prefer to stay quiet in class. It gives them an opportunity to think a little longer before they respond.