Guests can click Like button, the button then says Unlike but nothing has really happened

When guests click the Like button, it text changes to Unlike, like if their click actually was registered.

The expected behavior would be some notice like "You need to log in to like".

I've tried to identify the script handling this and found /media/com_easydiscuss/scripts/likes.js but I does'nt seem to make any difference. Can you tell me which script handles this, I would like to use some easydiscuss built-in function for displaying the notice as well.

Thanks