I suspect that a great salary helps attract/retain - but (and I'm not a rockstar coder who has to worry about this) - but out of the FAANGs, Facebook on the surface looks to be the least interesting.

There's the big social media silo and the Oculus and Whatsapp acquisitions - but nothing I look at and think "it would be cool to work on that". Just feels similar to some of the old guard like ebay - a dominant company that makes and I'm sure can pay well, but nothing I'd cut off my left arm to work on.