and while we are on the subject of simple communications platforms - here's a nice little blog post I came across about the many uses of Twitter (and yes - I found it on Twitter...).what stood out for me was the following quote:
A diffuse kind of ad-hoc educational institution emerges from the twittersphere in this way. There is no teacher and no student. We’re all teaching and learning from each other.
So if you still don't know what it is, now's the time to find out... about twitter