Since Tunisia's so-called Jasmine revolution, the world has been watching for similar protests elsewhere in the Middle East. Today's violent "day of rage" against a newly appointed Lebanese prime minister was part of an ongoing story. More surprising was today's demonstration in Cairo, where political dissenters have been repressed during three decades of rule by Egyptian President Hosni Mubarak. Though not all of the 80,000 who signed up on Facebook turned out for the rally, thousands did, only to be met by 20,000 police who swung batons and sprayed tear gas. Matt Bradley is Cairo correspondent for the Wall Street Journal and Dow Jones news wires.