Comment by mgraczyk

Fair and sorry about that

Specifically what happened, and I think this is all public now is that prior to 2016 journalists and news organizations argued that Facebook was demoting news for various reasons. In reality it wasn't very engaging so it was automatically demoted. They promised to boost news more in early 2016, but largely as a result of worse engagement and negative experiences (arguing in comments) Facebook started ranking news worse than other content. This all happened in 2016, months before the general election

And while Russia did run ads, it was mostly not political and the political content they ran had very little engagement. Russia mostly focuses on conspiracy theories and undermining American institutions. Facebook was aware of this in 2016 and certainly did not contribute to it intentionally, and I don't believe even by accident of some kind of misguided A/B testing

The reason Facebook got worse for younger people is because younger people stopped posting.