The document examines the Twitter use of five US mayors: Michael Bloomberg of New York, Cory Booker of Newark, Annise Parker of Houston, Mick Cornett of Oklahoma City, and Lee Leffingwell of Austin. It finds that their Twitter presences reflect their differing personalities and governing styles, with Cory Booker being the most active and responsive to constituents. The document also notes that social media's role for politicians is still evolving.