1. Good quality true "Web scale" work.
2. Top benefits (and I suppose a decent paycheck too).
3. Smart peers.
4. Realistic chances of hitting the IPO/Acquisition jackpot through equity.
Whats not so great at working there?
2.) I would guess that top programmers can have top benefits in several companies. Even less excellent programmers could get a decent paycheck in many places
3.) I am not familiar with the demographics of facebook but my gut feeling is that most of the programmers are in their early twenties or mid-twenties. This was also my impression during one of the job fairs that I have attended.
Definitely extremely smart peers
At the same time it seems that top programmers are moving to Facebook. Do they see something in the potential of the company that I fail to see. I guess the possibility of huge financial success besides the "stockmarket" value that is already established they foresee something else.