You see promotions all the time on Facebook. Leave a comment on this status update and you might win a box of widgets. Upload a photo of your pet lizard to our page and receive a box of crickets (yes, folks, lizards LOVE to eat crickets—just make sure the blasted things don’t leap out of the cage). “Like” this post . . . . I, for one, do not believe you should run promotions on Facebook. You may wonder why. [...]