This is correct - I can confirm that it's happening on large pages with millions of followers that were going well. All followers are legit and these pages are posting links from sites that are well regarded and enjoy healthy organic traffic - so all sites are regarded as top quality by Google (and you know that it's not easy to get to authority level in Google). I am quite sure that it's happening in many more pages but they keep quiet as they don't know what "hit" them...
Links have single digit reach (not quite zero but very close). Videos have huge reach. Images have good reach. (see the attached file as a proof, it shows the screenshot of reach for each post type). Video is more than 100K but link reach is 2 (not a typo - it is two)
The only thing in common to these pages is that a few weeks ago they got penalty from FB for only one week which only affected links - according to Facebook they were sharing something along the lines of low quality information. But this was only applied for one week and has been lifted. I need to be quite clear - I know the owners well and the links were pointing to authority sites that are ranked well in SERP . But FB decided that these sites are worthless. Weird - Google thinks that they are top and direct a lot of organic traffic to them.....
In any case the penalty was mentioned quite clearly and was only for one week. But the current situation has absolutely no explanation from FB and I suspect that this is part of their new plan "for ridding your News Feed of fake news"
Weird - why they allow videos and Images and why don't they mention clearly why they dropped the reach of links? At the same time I can see some rubbish pages posting "viral" content that is clearly fake. If a page posts low quality info video should be blocked as well. I guess that FB has the answers..
In any case you all know that traffic from FB is quite poor nowadays so not much of a loss but it would be nice to get something formal from FB
