Instead of teaching how to use a hashtag and how to tweet and retweet, I give my students meaningful tasks to help their learning. (Twitter plays a large role in my teaching, but the essential elements can be applied in many technological contexts.)
Since my FYS college class has been using Twitter for class discussions, I am much more interested in what others have to say. I am engaged in the class, not distracted. We must learn to use this new technology, not act like it doesn't exist.