No one could have known that when a Tunisian fruit vendor set himself on fire in a public square in a town barely on a map, he would spark protests that would bring down dictators in Tunisia, Egypt and Libya and rattle regimes in Syria, Yemen and Bahrain. Or that that spirit of dissent would spur Mexicans to rise up against the terror of drug cartels, Greeks to march against unaccountable leaders, Americans to occupy public spaces to protest income inequality, and Russians to marshal themselves against a corrupt autocracy. Protests have now occurred in countries whose populations total at least 3 billion people, and the word protest has appeared in newspapers and online exponentially more this past year than at any other time in history. Everywhere, it seems, people said they'd had enough. They dissented; they demanded; they did not despair, even when the answers came back in a cloud of tear gas or a hail of bullets. The root of the word democracy is demos, the people," and the meaning of democracy is "the people rule." And they did, if not at the ballot box, then in the streets. Protest is in some ways the source code for democracy - and evidence of the lack of it. For steering the planet on a more democratic though sometimes more dangerous path for the 21st century, the Protester is TIME's 2011 Person of the Year.