Check out this article about Newark, New Jersey Mayor Cory Booker . Key quote:
Faced with cash-strapped budgets and struggling schools, he secured a $100-million (U.S.) donation from Facebook founder Mark Zuckerberg to reform the education system. He has deployed his considerable charm and extensive Rolodex to lure large businesses to the city. Mr. Booker is also at the vanguard of a group of politicians, among them Calgary’s mayor, Naheed Nenshi, who have embraced social media with zeal.
Source: Globe and Mail, June 4, 2011
The Mayor’s social media sites: