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Q: 

How to know whether the facebook application has been connected

I am trying to implement a facebook application, but i am trying to use the prompt-permission tag but the link not appear and only show the text. The text change to link when I clicked the facebook's CONNECT button.

So when a user login through the facebook (not from Connect button), the link won't appear... Is it because the user doesn't know the user already logged in.

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