[pharaohgeek]

OAuth isn't solely about social networks. There are a number of corporations that use it for delegated authorization. A financial aggregator and a bank, for example. A large number of SaaS providers support G-Suite logins for enterprise customers as well.

[oaiey]

Oauth2 / OIDC is essentially next to SAML the only serious identity provider protocol in the single sign on space.

Ignoring LDAP and Active Directory for now.