If they really want to make the world a better place they should come up with some way of spotting some of the verifiably false news stories that get posted there. They could do it nicely, maybe: "Hey did you know this story may contain many factual errors? Check it out on Snopes.com!" Facebook could even set up their own fact checking service if they wanted to, it would be good PR for them.
And it's important to be nice but you have to be able to say "this sucks" sometimes too. With a guy like this Boz who's doing a good job but has a natural inclination to steamroll people maybe they should have set him up with some sturdier folks and let them fight it out instead of creating an atmosphere where he's afraid of being fired for being direct. That sounds like poor management, IMO.