I agree with rethink. Few months ago few of my friends did a promo of a short film, they advertised it so much that i got so irritated due to which, just for there sake, i posted the link on my fb page. I recommend you to do that too. Tell all your friends to post the link and request them to like the page and you'll get more likes on it. Talking about me, i haven't liked it yet but will do if i see anywhere. good luck,