OpenID is an standard that describes how users can be authenticated by 3rd parties which means that websites don't have to store user credentials.

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How to find a list of sites that I've authenticated with using my Google OpenID?

I use Google's Profile feature when logging into sites that support OpenID. Is there a way for me to get a list of all the websites that I have logged into using my Google Profile as my OpenID.
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How does one log into Facebook using Linked Accounts?

I have linked my Yahoo and Google accounts with Facebook via the Account Settings. Both of them now appear in the Linked Accounts list. Displayed immediately above them is the following: If you ...