I can second dkasper's observations -- the PSC cycle is engineered to reward initiative. That said, depending on the team, the practice does not always follow the theory, so it makes sense that the FB employees your company could poach may have been the ones unsatisfied with the way their team rewarded initiative.
Kent Beck became a former Facebook employee because he wasn't in to proving he was moving the needle on Facebook's key metrics. He was only giving world class mentoring to young Facebook engineers and improving the development culture.
