I have long advocated that blogging is a thinking tool and not a publishing tool. And so many non-bloggers have looked at me as if I was crazy. I will say it again the only way you get to REALLY understand social tools is to play with them. Things then emerge that were not apparent by looking at them or reading about them.
If you don't blog and still don't quite get it - take a look at what Seth Godin has to say about blogs for example it does not matter if no one reads your blog! short video clip
with Tom Peters. He is SPOT ON!