"I [think] I am already doing the work of one grade above me... at Facebook."
Is more often the case. It's interesting to see folks who act on that thought and find out they were mistaken. A manager of mine once quipped "The grass is always greener somewhere else, but sometimes that is because it's astroturf."
For a while, this was a really good way to become a millionaire. Then Facebook IPO'd and we had to settle for "I'm already doing Larry's job...for a startup."