Of course Facebook refused! They were hiring many more employees than Google was as a percentage of the starting employee base because of the insane growth they were undergoing. They were building a business, they had to keep poaching.
I don't think Facebook should get much credit for not participating, when they couldn't have.
Also, from a more game theoretical approach, they were a free rider on the collusion - they could have outed the collusion if they were that benevolent, since they clearly knew what was happening. Why didn't they publicize the blatantly wrong agreements at the time?
The fact that it was in Facebook's interest to do the right thing doesn't change the fact that when it came to it, they did the right thing and Google, for all their "don't be evil" talk, did the wrong thing. That's what really matters in the end.
And I don't particularly like having to say this, because I've been a Google fan ever since I switched to their search engine from AltaVista, whereas I think the world would be a better place if Facebook shut down their servers and deleted their database tomorrow. But yes, damn it, Facebook does deserve credit here.
They would deserve credit if they acted against their best interests by making it known what was going on at the time, but they knew they were benefiting from lower than otherwise salaries due to the collusion.
I don't think Facebook should get much credit for not participating, when they couldn't have.
Also, from a more game theoretical approach, they were a free rider on the collusion - they could have outed the collusion if they were that benevolent, since they clearly knew what was happening. Why didn't they publicize the blatantly wrong agreements at the time?