"Social media is an imperfect sales tool. Even if you have a following of hundreds of thousands of people, a small percentage of those will see your posts about your work, a smaller percentage of those will click through, and a smaller percentage than those will actually buy.
Social media alone is not going to make a book a bestseller, which I hope is an eye-opener for publishers who are relying on an author's social media efforts alone to sell books. The list of megabestsellers who haven't so much as sniffed at Twitter are legion.
But that still doesn't mean you should abandon social media. Here are three main reasons why:
1) It's not perfect, but it works"