This document discusses online identity and authentication. It provides a history of authentication methods like usernames and passwords, which have security issues. OpenID and OAuth 1.0/2.0 were developed to improve authentication but still have flaws. Identity providers like Google, Facebook and Twitter now allow social authentication, which two-thirds of users prefer over creating new accounts. While convenient, social logins reveal more user data than required just for authentication. The document stresses the difference between authentication and authorization, and that authorization should enhance rather than impair the user experience when used properly.