When I published In Leah's Wake in 2010, self-publishing was, for all intents and purposes, in its infancy. Yes, authors had been self-publishing for years, but it was only when e-readers finally entered the mainstream that self-publishing exploded. Suddenly, platforms like Amazon's Kindle Direct, Smashwords, and B&N's PubIt made publishing an e-book inexpensive and easy. Still, there were hurdles: proper formatting and conversion posed challenges and there were few services to help indie authors.
Source: Huffington Post