What is the best way to promote eBooks?

More and more authors are flocking to Facebook and Twitter to publicize their work.
Another way would be by creating a blog for your book and having others promote it for you through affiliate programs.
Promoting your book through an affiliate program is a great way to generate more exposure and sales for your published work.

who is writar a book 

fastfal is respect and poplar a writar  moblising in a public

i think you are selling something can be targeted very well, i bought a book ( Marketing research) cost me 80$ something like that , i'm a marketing information ( customer ) am seeking informations i want to keep myself updated , i believe that it's extremely important for you that you must identify your target market.
- you must identify the events that caused someone to buy your products/ebooks ( perhaps need of informations, looking for something to learn ..etc) !! - also identifying the characteristics of the people were that were experiencing these events ? their ages , gender , how much they earn? they like to read online PDF or what kind of books categories that make them feel interested ? -where is your target market spends time ? social media / cafe shops / gym / malls or in bookstores you must know where is your customers ?? - when and how i can shoot them ? what is my values for them ? personally, if i open my linked-in and i saw an interesting ad talking about a business book with a value like the author is someone i like , and it's in a good price or promotions or a book with a training course or access for video training like pearson online learning with their marketing lap http://marketingint.pearsoncmg.com i cant keep myself from not buying it, in another hand it's was the right product( marketing book ) , for the right target (me a marketer) , at the right price ( affordable for me ) at the right place ( linked in) i hope you got my point :) good luck.

1- Share the book ( Name of the author , publishing year, publishing house , etc)
2- Copy and past a few pages from the book.

3- Make an Interview with the Author if you can
4- Write an Article about the book .

5- write a critique about the book
6- share the book and your Interview & Articles every where .