It knows ONE word. You have to get that one correct, then the second word it doesn't know. It wants you to tell it what that word is. But it won't know if it isn't correct, which is why you can put whatever you want in.
Minecraft's joke was pretty funny, Locked chests would show up in worlds and direct you to a store like TF2's where you could buy keys for the chest, and things like Creeper Saddles, lol
I wanted to do it last year when merlins nested in my neighbor's yard, but couldn't. I hope they come back and I can do it this year.
That said I have a feeling that the Desktop Nether Portal will go the path of the Tauntaun sleeping bag and become a real product.
Frankly I don't think facebook cares, unless said fake account is spamming.
Also I can't wait for the first guy to get figured out with this then sue the company.