Big Brother still watching: Internet censorship on the up, report says

Chinese censors blocked information on the blind activist at the center of a diplomatic storm this year.

STORY HIGHLIGHTS

Hong Kong (CNN) -- Draconian laws, brutal attacks against bloggers and politically motivated surveillance are among the biggest threats to Internet freedom emerging in the last two years, according to a new report from free speech advocates, Freedom House.

"Freedom on the Net 2012: A Global Assessment of Internet and Digital Media," looked at barriers to access, limits on content, and violations of user rights in 47 countries across the globe. Estonia was rated as having the greatest degree of Internet freedom, while Iran, Cuba and China were viewed as the most restrictive.

While social media was key in the uprising in Egypt, censorship there continues apace, says Freedom House, a U.S.-based independent watchdog organization.

Although online activism is increasing, the report said authoritarian regimes were employing a wider and increasingly sophisticated arsenal of countermeasures.

Read more: The full report

According to Freedom House, China has the world's largest population of Internet users, yet the authorities operate the most sophisticated system of censorship. Its "great firewall" has become notorious for literally shutting down Internet "chatter" it views as sensitive. Earlier this year, censors blocked related search terms to prevent the public from obtaining news on prominent human rights activist Chen Guangcheng, who caused a diplomatic storm when he escaped house arrest to seek refuge in the U.S. Embassy in Beijing.

Read more: News on blind activist's escape

Major web portals and social networking sites, though not state-owned, have had to comply with strict government censorship rules -- or risk being shut down. After launching a campaign to clean up "rampant online rumors," Chinese authorities in March ordered the country's leading micro-blogging sites -- including Sina Weibo -- to disable their comment function for three days. In China, bloggers are also required to register their real names -- though it's not clear how many have complied with the rules.

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Big Brother still watching: Internet censorship on the up, report says