One of the most common uses of online identity is logging into websites. Today, app developers are generally faced with the difficult decision of either having their users log in with email and password or giving them the choice to log in with one of several third party auth providers (Facebook, Twitter, Google, etc.). Each path comes with its own set of sacrifices, and developers often choose what they consider the lesser of two evils. Developers either need to ask users to manually fill information and take on the burden of storing passwords or they must rely on third parties for auth and risk alienating users due to privacy concerns

http://blog.onename.io/decentralized-auth-identity-open-source/