By Author, Derek Haines 
on Just Publishing Advice site:
Twitter has become the go to social media platform for self-published authors over the years. Perhaps this happened because both self-publishing and Twitter were launched at roughly the same time, or the immediacy and ability to blatantly flog a product on Twitter was a better fit than other platforms that constrain or demand payment for product plugging.
For whatever reason, Twitter has definitely become seen as the essential platform for self-published authors, but is it effective in delivering what authors want? Book sales. Does Twitter sell ebooks?
Chris The Story Reading Ape's Blog 
Reblogged this on Die Erste Eslarner Zeitung – Aus und über Eslarn, sowie die bayerisch-tschechische Region!.
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Reblogged this on Maciver blog.
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I think it depends on how much twitter followers are interested in buying the book. I had a very good sale results with a book promotion site for authors called goodkindles, which uses twitter as their main social channel
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