Kindle Nation Daily is a website consisting of a large community of readers and Kindle enthusiasts. This website connects with 177,500 averagely on a daily basis. So it is obviously a place where you get to advertise your book. This is done through sending advertisement about your book in web posts, emails, Facebook, and Twitter.
There are a large variety of sponsorship programs to choose from, like on a daily basis or a weekly one.You choose by clicking here and choosing one option. When you choose a particular program, you have to choose the dates for the book to be advertised and then purchase that package.
You also have to mail to email@example.com along with the forwarded copy of the email you receive from Kindle Nation containing your confirmation details and an e-copy of the book you need to advertise for them to review it before advertising.
It should be in Kindle-compatible formats like MOBI, DOC, TXT, RTF, HTML, PDF and not in EPUB, AZW or DOC-X formats. In case they reject to advertise the book, they would refund the money back.