zefrank of The Show has given his viewers a mission: make the Earth into a giant sandwich. All you need are two strategically placed slices of bread on exact opposite ends of the planet, and bang: sandwich. And people all over the world are sending in their pictures of bread, on the ground, ready and waiting for somebody to help them complete the tasty meal.
Now this may sound all cute and everything, but I think I know what's really going on here. Think about it, people. Making the Earth into a sandwich? Who could benefit from something like that? Yes. You're right: zefrank is obviously a herald of Galactus.
Make peace with your gods.