The blogosphere is now dominated by younger adults age 21-35—those who have grown up during the blogging revolution—and bloggers in the US account for the plurality (29.22%) of blog posts worldwide, according to a study by Sysomos.
Bloggers age 21-35 accounted for 53.3% of over one million blog posts analyzed, followed by bloggers under age 20 (20.2%), those age 36-50 (19.4%), and those age 51+ (7.1%).
The gender composition of the blogosphere is nearly evenly split between women (50.9%) and men (49.1%).
Below, other findings from the Sysomos study, which examined the demographic composition of the blogosphere.
Bloggers in the US account for nearly four times as many as in the UK (6.75%), the second-most active country in the blogosphere.
Japan accounts for 4.88%, followed by Brazil (4.19%), Canada (3.93%), and Germany (3.34%).
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By contrast, the US accounts for over one-half (50.9%) of Twitter users worldwide, followed by Brazil (8.79%) and the UK (7.20%), according to a separate study by Sysomos.
Particularly notable is the absence of bloggers from Indonesia and Australia within the top 10. In the Twittersphere, both countries rank among the top 10 with 2.41% and 2.39%, respectively.
In the US and Canada, California led with 14.10% of blog posts—nearly double the numbers of blog posts of the next most-active state, New York (7.16%).
The province of Ontario (home of Sysomos) was third (5.59%), followed by Colorado (5.25%), Texas (4.37%), and Pennsylvania (4.34%).
About the data: The findings are based on analysis of over 100 million blog posts analyzed by Sysomos in May 2010.