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I have used my Facebook account and Gmail account to access dozens of sites.

How can I find out on which sites I've used these authentication methods?

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Are you referring to Facebook or Gmail? Because there’s Gmail in the title and Facebook in the body of the question. – Alex Aug 20 '14 at 19:31
Your Gmail question is a duplicate of this one: How can I figure out which apps have access to my Gmail? – Al E. Aug 21 '14 at 1:16
So you should probably change this question to be just about Facebook (which may also have a duplicate). – Al E. Aug 21 '14 at 1:17
@AlE. Thanks for the tag wiki edit, that was a goof on my part. – jonsca Aug 21 '14 at 5:07

You are asking two similar questions. My answer will try and address both.

To see which sites have used Google Authentication:

  1. Login to your Google/Gmail account.
  2. Visit their account permissions page

To see which sites have used the Facebook Authentication:

  1. Login to your Facebook account.
  2. Visit their app settings page

More info: Facebook uses a variant of the OAuth2.0 protocol. Google+ Sign-In is built on the OAuth 2.0 and OpenID Connect protocols.

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