Do I need permissions to access a Facbooker’s Facebook user ID in the following case:
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The user is logged into Facebook.
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The user then follows a link from Facebook to my webpage.
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My webpage grabs their Facebook user ID (Is this part possible without asking for special permissions from the user?)
Yes, to identify that the user is indeed logged into Facebook, you need to follow one of the authentication paths to find out if they are indeed a user. Facebook won’t give you any information about a random web visitor unless they have logged in and authenticated your site.