For Authentication, it will be cool to have something like Twitter Digits(https://get.digits.com/ https://get.digits.com/) or Facebook Account Kit(https://devel

For Authentication, it will be cool to have something like Twitter Digits(https://get.digits.com/ https://get.digits.com/) or Facebook Account Kit(https://developers.facebook.com/docs/accountkit https://developers.facebook.com/docs/accountkit), which is basically SMS authentication without password.