NBC Local, the network of 10 regional U.S. Web sites created around the company's television stations, is expanding its social media/user generated platform, called SoMyCity to the iPhone, which launched this weeki. The SoMyCity, which allows users to surface up comments and photos to the NBC sites, as well as Twitter and Facebook was launched in July. Social media interactions on the NBC Local sites have reached 300 thousand per month, we have been told. Presumably that number will increase with the iPhone app. Earlier this week we went to NBC headquarters at 30 Rock to interview Katherine Wu, VP of Operatons, Local Integrated Local Media for NBCUniversal. Katherine explains the value of social media on the site new iPhone application. Andy Plesser, Executive Producer Less