on The Digital Reader:
KDP (Kindle Direct Publishing) is widely seen as a self-publishing portal. This is funny both because publishers use it to manage their titles in the Kindle Store, and also because there is actually very little in the way of author tools in KDP – it is strictly a publishing portal.
Amazon does have an author portal called Author Central. This is where authors can upload their head shot, bio, and other details for their author page on Amazon.com. They can also use it to track the Amazon sales rank for their books.
Chris The Story Reading Ape's Blog 