Jackie left some interesting thoughts on a comment a while ago on my post about knitting blogs. I figure I'd answer here.
I wonder if it's that scientists are overrepresented in the knitting world (and vice versa) or that scientists are more likely to blog about it, as Jackie suggests. Huh. I wonder how I could figure out which it is. Could be both.
As for knitters/scientists not being bloggers. The numbers for online forums go like this: 90% of people are lurkers, and only read but never contribute; 9% contribute every once in while; 1% are regular contributers and basically write the majority of the content. If blogs are like forums, and we already know that the vast majority of blogs that get started are neglected pretty early on and hardly ever get regularly posted to (this would be the 9%), then multiplying regularly updated knitting blogs by 100 would get you the number of knitters around. I think this is a very conservative estimate, though. I think starting a blog has a higher activation energy threshold than commenting on a forum, i.e, it's more work to start a blog than to simply type up a comment on a forum. So probably the number of people who start blogs is much, much less than 10% of people who read them. So the number of knitters around is much higher than 100 times the number of regular bloggers.
Of course, then you have to add in the number of people who don't even read knitting blogs.