Facebook Connect

Facebook Login enables third-party apps and websites to delegate authentication to Facebook. Developers integrate using OAuth 2.0; Meta also provides OpenID Connect ID tokens in the standard manual flow and via the Limited Login mode in the iOS SDK (Authorization Code + PKCE).

Key Capabilities

  • Familiar, low-friction sign-in: Users can sign in with an existing Facebook account instead of creating new credentials.

  • Standards alignment: OAuth 2.0 with documented OIDC options (ID tokens, discovery endpoints for Limited Login), including validation guidance.

  • Granular permissions: Apps request specific scopes (e.g., email); Meta’s permissions model governs exactly what profile data is shared.

  • Optional messaging opt-in: “Login Connect with Messenger” lets people opt into business messaging during the login flow.

Limitations

  • Scope & data constraints: Only the data granted via permissions is available; many fields/permissions have been deprecated over time.

  • Limited Login trade-offs: The Limited Login OIDC token is intentionally restricted and cannot be used to fetch additional Graph data.

  • Not a full IAM/IGA: Facebook Login is an auth mechanism, not a provisioning or governance system (no SCIM user lifecycle).

  • Platform dependency: Implementations are subject to Meta policies, review processes, and UI requirements; breaking changes and permission deprecations can require app updates.

  • Ecosystem variability: User trust or availability is tied to Facebook usage; outages or account issues at Meta can affect sign-in.

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