On Day One Michael Alvear contributed a piece for the conference called How to Sell E-Books without Falling into The No-Value, Time-Sucking Vortex Of Blogging, Tweeting, And FaceBooking.
Alvear's extremely readable premise is that blogging, tweeting, and Facebooking are valueless time sucks for eBook writers. If he's correct, I'd argue that they're also valueless time sucks for any kind of writer.
Alvear is talking specifically about Kindle eBooks here. He also suggests strategies that writers should concentrate on instead of social media to sell eBooks on Amazon. I wish he'd given more information on how, though.