Facebook reach on large news niche - plummeted last 7 days

Are there any warriors here who can help?

We run a popular news site and Facebook page. In the last 7 days, the reach and referral traffic from FB has plummeted.

I know one or two other people in a similar niche that this has happened to, but others seem to have remained unaffected.

Possible reasons:

1/ Clickbait headlines - to be fair, our headlines are no more or less sensational than the major newspapers and others in our niche. We've had very healthy engagement for the last few years and have survived all of the major FB algorithm changes (with a few inevitable bumps here and there).

2/ Facebook went 'offline' recently - the recent decline in reach and referral traffic completely coincides with the two days last week where Facebook got knocked offline. It was widely reported. What hasn't been quite as widely reported, though, are other pages noticing a dramatic decrease in reach. Has anyone else got any more info on this?

3/ Trolls/competitors - some of our content attracts a LOT of attention, and not all of it is wanted. Due to the volatile nature of politics at the moment, could we be victim to paid saboteurs (who may be reporting our stuff as spam or something)? Is there a way of knowing that this is taking place? Can we protect ourselves?

Anyone out there with experience, I'd love to get your views on this. It's pretty dire at the moment.