Everybody, let's give a warm hello to Rachel Sterne! The 27-year-old GroundReporter was just named the city's first Chief Digital Officer, a job described as helping "develop forward-thinking policies on social media, digital communications, web 2.0 initiatives and other tools to better serve the public," that starts with a salary between $75-125k. Her first assignment? A 90-day report on the city's online strategies. Sterne also founded GroupReport, has done a bit of consulting, and works as an adjunct professor at Columbia Business School. In 2009, BusinessWeek (before it became Bloomberg BusinessWeek, natch) named her one of America's most promising social entrepreneurs.