How to check reposts in Facebook API?

Question

Facebook

PHP site Need to check if a certain facebook user reposted a certain post. Is there such an API plan in Facebook, Twitter or somewhere else?
At least you need to know if they exist or is it possible to do this?
Maximum how?
Who knows respond. Something I can't find. I would like to understand if I am at least not wasting my time?

Answer 1

Study the documentation on sharedposts (that's right, not reposts) and users . But a cursory acquaintance suggests the idea that you most likely will not be able to realize your plan.