[bvirkler]

Basically, OpenID Connect is for federated authentication, and OAuth2 is for delegated authorization. I like Vitorrio's explanation: http://www.cloudidentity.com/blog/2013/01/02/oauth-2-0-and-s...

[soapdog]

Even though its community maintained these days, Mozilla Persona was a great authentication mechanism with federation support. I loved using it. A pity it failed to get traction.