In the best classrooms there is a good balance of different activities, including “lecturing”,and that kind of variety lends a sense of pace to the lesson, and helps to make it a good and enjoyable learning experience for the students.
If someone follows you in Twitter, the polite thing to do is reciprocate, right? Well, maybe so, but I think it needs a little more thought than that. Here is a list of the steps I take when someone follows me.