Hi there,
Those are the steps I've made to configure Facebook login:
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Went to http://developers.facebook.com/ and first had to validate my Facebook account with my credit card.
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Created a new Facebook Application
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Went to my Q2A website, Admin page > Plugins tab, then clicked Options next to Facebook plugin and entered there the Facebook App ID and Secret that got from the previous step.
Basically that's all, let me know if you get stuck somewhere :)