I think this article on simple linking vs. previewing sums up the issue:
https://theconversation.com/webs-inventor-says-news-media-ba...
https://theconversation.com/webs-inventor-says-news-media-ba...
We have a joke:
A: How much is a drop of gas?
B: A drop of gas? Well, zero!
A: One million drops of gas, please.
Straight up copying of course would be different.
Plain linking does not keep people on FB. Automated previewing does. Can't this be interpreted as raising the bar for fair use?
But you have to play that silly game, because otherwise your competitor might get featured instead and we learn about them and not you.