This is what I like to see – a fellow blogger (Brian Clegg) extolling the virtues of physics blogging and tweeting.
What’s interesting about Brian’s entry is that he talks about how a blog can trigger a discussion that increases the quality of the original posting. Like peer review for a scientific paper, but informal, instantaneous, and more widespread.
Read the comments attached to his posting, and you will see a great example of what he means.