I can’t see the Facebook post, nor can a lot of other people, but apparently it’s there… if you’re in the right location. Dunc of the ‘Jade even posted a screenshot in the comments of what he was seeing.
Given that the U.S. open casting call mirrors the open auditions being held in the U.K., and both vaguely match certain early casting breakdowns for Episode VII, it’s a safe bet the whole thing is legitimately Episode VII-related.
That means the sides are also legitimate, though probably not at all related to the content of Episode VII in any literal sense. Still, “Shut up and eat your apple” is a great catchphrase.