Despite the presence of 'book' in the name of social media's behemoth, Facebook is usually not associated with book selling or promotion. But with 1.6 billion regular users (about which it knows a great deal), Facebook offers a massive opportunity to engage in savvy marketing. Digital Book World recently published an article by Mark Dawson, who describes himself as "pretty much the definition of a midlist author". He cites specific strategies, gives his own sales figures and engages with commenters. Well worth a read.