I'm sorry, but really, there's no reason to believe a word a you say.
You get paid from Facebook, Facebook lied again and again, how on earth do you expect people to take you seriously?
Your job and title is to give FB the optics of caring about integrity, and was invented as part of FB PR in the aftermath of the Christchurch massacre.
The amount of cynicism is just mind boggling.
You are welcome to conduct research or fund it. You can even help current research by criticizing their research in its substance, or engage yourself politically (at least by voting) so we can have more and better research about the topic.
It's not the lack of research that's a problem, it's the weaponization of research.
How do you think Facebook should deal with this? If Facebook-funded research is suspect and nobody else is able or willing to fund it (why should someone else fund soemthing for Facebooks potential benefit, when Facebook are rich, and if someone else is funding research for Facebooks detriment, then I would say its equally suspect), how should such research be funded then?
How can you show results of the research in a way that you wouldn’t consider as “weaponized”?
I’m not a fan of Facebook and am quite suspicious of them, but I’m also not sure what they can do in this particular situation that we would find satisfactory,
Your posts sound like you believe corporations shouldn't ever do research and worse, that academics don't have any interest in the outcomes of their own work. But that's nonsense, of course they do. They want to publish papers, they want their research findings to be novel and widely cited, they want to build a reputation. They have all kinds of self-interested incentives that act against producing accurate research findings; hence the replication crisis!
Would be very interesting to learn about these countries where polarization has fallen if you have links to hand.
Although it's trivial to say "I see a lot of polarisation on social media, therefore it's worse than it was", a satellite-view paper like that NBER one gives zero insight into the role of social media, partly because the data isn't provided, but also because it doesn't examine what effects there might be on smaller groups within the population who are, say, heavy social media users.
I think the most useful thing Facebook could do would be to make more information available to researchers, rather than pointing to research which hasn't been able to use data and claim that helps exonerate Facebook.