Tomorrow's events, dubbed a "day of revolution against torture, corruption, poverty and unemployment" by protest leaders, were initiated by two dissident movements, both based online. One is dedicated to the memory of Khaled Said, an Alexandrian man beaten to death by police last year, while the other, "6 April", is a youth group named after the date of an uprising two years ago in the Nile delta town of El-Mahalla El-Kubra, in which three people were killed by police.

In a sign of how seriously the Mubarak regime is taking any challenge to its authority following the downfall of Tunisia's president Ben Ali, counter-protests are being organised under the banner of "Mubarak: Egypt's security". Organisers say they want to express their rejection of the "destruction of state institutions" by the opposition, raising fears of violent clashes on the ground."Regardless of how many people turn up, these protests will be highly significant," said Nabil Abdel Fattah, a political analyst at the semi-official Al-Ahram Research Centre. "Those confronting the regime on Tuesday will be the sons and daughters of virtual activism - a new generation that has finally found something around which they can unite and rally.They are the product of a government that has never offered them any ideological vision to believe in, and now they have themselves become a symbol of contemporary Egypt.

In a remarkable shift, the police, previously the enforcers of Mr. Ben Ali’s rule, organized a protest of their own on the city’s central artery, Bourguiba Boulevard. They wore red armbands in solidarity with the revolution, complained that Mr. Ben Ali and his family had put cronies in charge of the security forces and demanded a trade union that could negotiate for higher wages. Tunisians were stunned to see police officers, once silent and terrifying, complaining about their working conditions in interviews with Al Jazeera.

“The most rapid revolution in history,” he wrote. “Because we are connected. Synchronized.”

Abbas' security forces have previously mined social networks to catch dissenters. In November, an atheist blogger was arrested after posting incendiary comments about Islam on Facebook.

Modern communications technologies are already being deployed as new forms of repression.

not all blogs are revolutionary. China, Iran, and Russia all have bloggers who are more authoritarian in their views than their governments are. Some of these governments are even beginning to follow the path laid by Western corporations, actively deploying regime-friendly bloggers to spread talking points. Is this “samizdat”? Cold War baggage, in short, severely limits the imagination of do-gooders in the West. They assume that the Internet is too big to control without significant economic losses. But governments don’t need to control every text message or email. There’s a special irony when Google CEO Eric Schmidt suggests—as he did in a speech to the Council on Foreign Relations last November—that China’s government will find it impossible to censor “a billion phones that are trying to express themselves.” Schmidt is rich because his company sells precisely targeted ads against hundreds of millions of search requests per day. If Google can zero in like that, so can China’s censors.

modern authoritarian governments control the web in ways more sophisticated than guard towers

In Egypt, where the leadership continues to rely on a decades-old emergency law that allows arrest without charge, there is a lot of room for free and critical speech, offering a safety valve for expression that did not exist in Tunisia, he said.