Good report. I would say this differently than @RobbyMook. It's not so much that the misinfo makes Facebook $. It's the structure which provides velocity & reach to misinfo is core to Facebook's entire business. Misinfo is impossible to police so the biz model becomes the vector. 
It's a similar problem to political ads. It's near impossible to fact-check all ads (and a good argument they shouldn't) so the attack vector should become the microtargeting of political ads which is what allows political statements to avoid sunlight to disinfect. But FB won't..
and lastly a reminder that "disinfo" is a better term for the issue which is the real harm in misinfo as it shows intentionally doing it. If it's paid advertising and you don't want fact check it then you must suspend microtargeting.
