That was a T-shirt worn by one of the computer scientists here in Oxford.
The question is who are blogs for? You can use them between a group of people to share thoughts. I use them to try and arrange the ideas that pop into my head and to link them to some sort of evidence on the web. For me they are a research tool but also a way of helping keep control of your research group. You can share the literature and hopefully students will feel that they have better supervisor input with a shared research experience.
So I would not expect almost anyone to read my blog but does that devalue it? It is part of an online community of web teachers of Biology at University level (Do not tell them I am a Chemist). So who will read this anyway!