Retrieve Facebook User ID (or anything unique) without Authentication? -

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is there anyway facebook id of user without forcing them authenticate? i'm trying create app page user can add answer poll once, need able identify viewers kind of unique identifier.

my preference not force them log in. think it's bad ux add 2 steps can make sure facebook user on facebook page unique. don't need permissions profile/etc.

btw, i've seen similar questions though nothing current or close enough me.

no possibility if don't make user log in, security reasons, user has aware collecting information him, it's why there login.

with php sdk, id after login:

$userid = $facebook->getuser();

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