How can I get user's facebook ID who clicked like button?

Is there a 开发者_开发百科way to get the user's facebook ID who has clicked like button of the social plugin on my own website? I couldn't find any way to make it even though I spent for searching it whole day...

As far as I know it's impossible for you to know who clicked a 'like' button, however if a user logs in to facebook through your site (meaning that you wrote some facebook app which retrieves the info) than you can access the information.

try reading the documentation in api.facebook.com, good luck.