I waited a while to reply to you, because the thread got overwhelmed with some pretty over the top opinions.

When I am considering whose resume is worth a call back for, there are a variety of signals:

  - Is your resume even vaguely coherent
  - Do you have things on your resume that suggest curiosity and the ability to get things done
  - Are you likely to stick around long enough to be worth investing in you? So if you changed jobs every 1-2 years, you're going to lose a lot of points
  - If you worked at a company which I don't think aligns with good treatment of the general public, how long did you work there? Was it early in your career, or late?

I don't think anyone is being discarded just for working at Facebook, but if you're borderline in any of these other categories, working for a long time at Facebook is certainly a negative factor for getting a call back.