Dear Facebook, why are Facebook Comments so unremittingly terrible?

For long months now, Facebook Comments have been riddled by some of the most transparent, eye-roll-inducing “I make a good salary working from home” spam you’ve ever seen. Every mail service can filter it out; but Facebook? Home to cutting-edge AI research, massively scalable services, some of the smartest software people in the world? Nope, spam appears to be beyond their capabilities.