Is it possible to obtain facebook likes using just a script?

I want to ask you guys one question: is it possible to obtain facebook likes from all the visitors that enter your website? Someone told me that using a script, the people who visit your website can give you facebook likes without knowing it. It sounds a little bit weird for me, maybe you guys can make it clear.

Regards and thanks in advance. Sorry if it is a stupid question, i am a newbie!