In a Neuron View article, Zen Faulkes argues for blogging as a kind of postpublication peer review. He is a veteran blogger, and science tweeter, and knows what he is talking about. The article compares social media  to the the classical forms of scientific discourse (from letter to the editor to talk at a conference) and likens science blogging to an online research conference, although which a much wider reach, even into the lay community. Read it here: Faulkes Neuron View