facebook like button - do you know if web user likes your page [duplicate]

问题

This question already has answers here:

How can I check if the fb:like button is already pressed on my own page? (1 answer)

How to check if a user likes my Facebook Page or URL using Facebook's API (5 answers)

Closed 6 years ago.

im bulding web app (sweepstakes), where user has to insert his data AND like one or maybe more facebook pages. Then he can continue and participate in sweepstakes. he cannot participate if he doesnt click on like button. So i have to know that user has clicked on the like button. How do i do it?

回答1:

Please refer similar post may be can help you out.

Facebook how to check if user has liked page and show content?

thanks.

回答2:

Please note that aside from the technical capability, this is actually against Facebook's regulations so this question is actually moot.

来源：https://stackoverflow.com/questions/7888022/facebook-like-button-do-you-know-if-web-user-likes-your-page