The Canadian analytics firm Sysomos has reviewed more than 100 million blog posts to produce data on age, gender and demographics of the blogosphere. There are some surprises in there.

To those who suggest women don't blog --- and that's an old assumption, mind you --- Sysomos notes that 50.9% of the posts came from women.

To those who believe older people are big bloggers --- and that's a new assumption --- Sysomos notes that 53.3% of the posts came from those 21-35 and 20.2% from those 20 younger. Only about 7 per cent came from those over 50.

More than 29% of blogs emanate from the United States, by far the largest national contributor to the sphere.