SimplexREPORTER

Bloggers under 21 come in a distant second at 20.2 percent, with the 36 to 50 bracket close behind at 19.4 percent. Only about 7.1 percent of bloggers are over 51.

While age helps define the blogging demographic, gender does not: male and female bloggers are almost equally split.

The United States has nearly one-third of all bloggers, with more than four times that of the next country, Britain. But blogging does not always match up with Twitter use. In another report from Sysomos, Indonesia, for instance, had the sixth most Twitter users, but was not even among the top 15 for blogging representation.

Mobile phones, which can be used for Twitter, are more common in Asia than are Internet connections, said Nilesh Bansal, chief technology officer and co-founder of Sysomos. In addition, he said, “when blogging was booming, back in 2000, 1 percent of the Indonesian population had the Internet and hence they were not part of the blogging revolution.”