Facebook (Meta) actually has a cutting edge team that researches and fights disinformation, they publish some really cool research every few months I recommend reading it. Unfortunately, their efforts amount to pissing on a wildfire that the rest of the company is doing its best to dump gasoline on, since that team is under-resourced compared to the teams tasked with increasing user engagement.

I don’t use it either, but wikipedia (and common knowledge) suggests they do like censoring everything https://en.wikipedia.org/wiki/Censorship_by_Facebook