Is this cheating or immoral?

I made a video and entered it into a Facebook contest to see who could get the most "likes" (for 3000 mall bucks!) then i created a whole ton of facebook accounts. Nowhere in the rules does it say you can't do this, BUT the judges can disqualify you at their discretion. Is it still cheating if i like my own video 100 times. Or is it just out-smarting the rules. Is it immoral to do so? And, should I do it?