Maybe. These policies can be a double-edged sword. It really depends upon how they are implemented. Most of the ranking systems - and it sounds like Facebook's - rely on the immediate manager to do the ranking and the manager has a lot of leverage. It can become arbitrary. It can often come down to how much your manager likes you (outside of your productivity) or managers protecting turf. Enron had a system like this for dishing out bonuses and it boiled down to nonstop political battles to get better ratings.