To help you improve the sign-in user experience and security for your users, we're announcing new features in preview and general availability. These features give you several new options for customizing your Azure Active Directory (Azure AD) B2C user experience.
The following high-demand features are now available in preview:
· Custom password complexity
· B2C-specific audit events in the portal
· GitHub as an identity provider
Furthermore, the new features of Twitter as an identity provider, as well as migrating users with social identities, are now generally available.
Source: Azure Roadmap