Has anyone come up with a way of tracking what gets shared where? Perhaps with a hidden pixel or some other mechanism to track requests? Or is that impossible

Has anyone come up with a way of tracking what gets shared where? Perhaps with a hidden pixel or some other mechanism to track requests? Or is that impossible because Facebook is a walled garden? I'm thinking that since there is no check against Facebook's sharing algorithm going haywire (in effect censoring certain things for monetary gain) that that creates an incentive to not be fair. The public nature of the internet used to be our proof of fairness, for example with Twitter or YouTube. It occurred to me that the same 3 people that like my posts are probably the only ones seeing them, since I'm one of the only ones who likes theirs back. We're collectively hellbanned, and I can't think of a stronger incentive to quit using Facebook.