So wait, if you don't have a Facebook account you cannot enter this contest on the Facebook page they mention in their post? I guess it makes sense, my bet is you have to "Like" their page and then at some point they will print everyones names out on a large sheet of paper and tape a piece of chicken feed to each name. Then bring in a blind folded rooster and let him figure out that he is walking on chicken feed. Even though he won't be able to see, we can assume that a rooster main motive besides making more roosters/chickens is to eat right? So he will randomly pick a piece of chicken feed to eat and well wait a second...
I guess it doesn't make much sense to have the rooster blindfolded, it's not like he can read names, and even if he had some sort of super rooster powers and could, I don't think he would be very biased as I would imagine anyone with a rooster who could read wouldn't necessarily be introducing him to too many people. In a nutshell, I think it would be alright if he could see.
So the rooster, sans blindfold, will eat a piece of chicken feed and that person will win!
But getting back to your point, I can see how having to "Like" the page would require one to be a member of Facebook and I guess there isn't much else to say about that.