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I'm about to upgrade vBulletin and Q&A on a single domain.

Is it possible to configure a single Facebook login for both of these code bases?

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Yes it is very much possible as Q2A supports external signin overriding -> http://www.question2answer.org/single-sign-on.php

and vBulletin also has uspport for SSO (Single Sign On) http://www.vbulletin.org/forum/showthread.php?t=270517
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