ZeroZero to 100,000, Social Media Tips and Tricks for Small Businesses by Sarah-Jayne Gratton & Dean Anthony Gratton is one of the best books I've read on social media marketing.

There's a book out there I haven't bought or read yet called Every Book is a Startup. Once you acclimate to that premise, that every book is a business (which is a big step for all poet-kind), you can see understand how learning about how to market your small business (and what could be smaller than the poetry book business?) might prove useful to your endeavors. If only Walt Whitman had the Internet to work with!

This book recommends itself in four ways:

  1. Explains what the main social media tools are and why they were created in the first place. It's a concise history of social media for newbies and advanced users.     
  2. Explains why these tools matter to a small business.
  3. Shows you how to evaluate your social campaigns after you implement them.
  4. Gives real life examples of small business owners and
    entrepreneurs who have used social media to raise awareness of their
    products.

It's also a fast read.