The authentication with Facebook connect failed, cannot find authentication tokens
External login services use OpenID technology, where your password always stays confidential between
you and your login provider and you don't have to remember another one.
Validate my email after I login.
Facebook
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Or...
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Why use OpenID?
With the OpenID you don't need to create new username and password.
You can safely re-use the same login for all OpenID-enabled websites.
There are > 160,000,000 OpenID account in use. Over 10,000 sites are OpenID-enabled.
OpenID is based on an open standard, supported by many organizations.