What Every Author Ought to Know About Selling Books With Social Media
From Book Cover Cafe

A Little Love From Book Authors for Twitter
From Miller Mosaic, LLC (Social Media Marketing)

The Myth About Being “Liked” (on Facebook)
From Author Marketing Experts, Inc

9 Ways Authors Could Use Google+ to Drum Up Awareness and Sales
From Chris Brogan (on Google+)

5 Ways Writers Can Break Out of the Tired Old Social Media Box
From Copyblogger