I combat that easily. They are always posting pictures of their food on Facebook. My 16 year old cat, Stubby, is shall we say very set in his ways. When he uses the cat box, he never covers it up. Ever. So I waited one night after he dropped a BOMB in the cat box and took a good clear close up picture of it.
Now when somebody posts a pic of their food on Facebook, I counter it by posting a picture of Stubby's bidness. That shuts all that right down.
