Young philanthropist and Facebook CEO Mark Zuckerberg gave a sizable challenge grant to Newark, N.J., schools, and now Mayor Cory Booker must determine how best to spend it.
For connecting more than half a billion people and mapping the social relations among them, for creating a new system of exchanging information and for changing how we live our lives, Mark Elliot Zuckerberg is TIME's 2010 Person of the Year