I know how can I intercept the event when a user clicks a Like button... now, I want to log also the user ID of the user. How can I do that?





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You can get the user ID from the Facebook session.

Sample code is listed below:

FB.Event.subscribe('edge.create', function(href) {
 session = FB.getSession();
 uid = session['uid'];
 // do whatever you want



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