Bullshit jobs certainly exist, and in great numbers. The proof is in the fact that many of the people who "do" these jobs actually goof off a significant part of their working day and yet things still march on as if nothing is different.

In places I've done contracting work I've seen vast offices full of these folks, and it almost feels to me as if their bosses are sort of covering for them. Cubes full of people browsing Facebook at least half the day.