I like using Twitter, Kimberly, even though my students are not always the most open to using it (regardless of the age of the students I am teaching at the time). There is increasing discussion about using it, from everything as a test review to a classroom backchannel, though I suppose the main issue is that communication in education has changed and continues to change quicker than those of us who have finally figured out how to expect even basic email communication in a class.