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This is what it shows me when i click on fb login button when i am already logged in in www.facebook.com
"Blocked address URL:This redirect failed because the redirect URI is not whitelisted in the app’s Client OAuth Settings. Make sure Client and Web OAuth Login are on and add all your app domains as Valid OAuth Redirect URIs."
when i am not logged in in www.facebook.com shows me that: 
"Not Logged In: You are not logged in. Please login and try again."
Q2A version: 1.7.4
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go to the facebook app (if created already, else create) and whitelist your domain/Uri/IP.
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Did you setup your facebook app?
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YES WE SETUP

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