So General Motors is back on Facebook. Less than one year after its very public split from Facebook, right before the social network’s initial public offering, the old-school advertising behemoth is back and is looking to Facebook — specifically Facebook mobile — to help add luster to the launch of its new Chevrolet Sonic, aimed at young people. So why? And why now? What’s changed since May 2012? Has GM adjusted its opinion of the potential of Facebook as an advertising vehicle? Or has Facebook learned from the experience and figured out how to sell its advertising story to brands with deep pockets like GM?
Lisa Raphael (left), the social media producer at Katie Couric's daytime talk show Katie, is one of our featured speakers in Mediabistro's upcoming 
