Featured Website: Books 4 Dozens Book Promotion Service
http://BOOKS4DOZENS.COM: "#Books 4 Dozens is an online book shop platform created purely to promote the ebooks of indie authors." Free and paid resources for book promotion, as well as ways for readers to find more titles. Their basic promo is free and includes multiple shares across several social media platforms. Follow them at https://twitter.com/books4_dozens. I've already tried it for one of my books. After approval, the posts quickly began appearing.