Amazon has gone live with a new feature for Kindle Fire devices called Login with Amazon. As you might expect, this allows developers to automatically use Amazon's log-in credentials when users sign in to an app. The standard is OAuth 2.0 compliant and supports both Android and iOS, though you'll only be able to get this single sign-on service on Kindle Fire HDX 7-inch, Kindle Fire HDX 8.9-inch, and Kindle Fire HD 7-inch for now. And more than likely that prototype Amazon smartphone that just leaked out today.

Developers interested in getting started can find Login with Amazon in the Amazon SDK, complete with documentation. As for end-users, how many of you guys are using Kindle Fires right now? Would a global single sign-on service be helpful for you when it comes to apps, or does Facebook handle that well enough already?

Source: Amazon Developer Console