Since 2003, 64 people have been arrested for publishing their views on a blog, says the University of Washington annual report.
In 2007 three times as many people were arrested for blogging about political issues than in 2006, it revealed.
More than half of all the arrests since 2003 have been made in China, Egypt and Iran, said the report.
Citizens have faced arrest and jail for blogging about many different topics, said the World Information Access (WIA) report.
Arrested bloggers exposed corruption in government, abuse of human rights or suppression of protests. They criticised public policies and took political figures to task.