First of all, if you do not follow Edutopia's articles, you should. There are many thoughtful and great ideas about utilizing technology in education. Second of all there are often articles that get you thinking about why certain technologies are beneficial to educators.
For example, Edutopia's article, Five-Minute Film Festival: Twitter in Education, provides a good reason in a set of videos as to why Twitter is so beneficial.
Now having used twitter for a long time, I have not really thought about this, but if you are a first time user, you will find these ideas useful.