Facebook gives 500$ per Bug reported, which ends up in a lot of Fail reports if somebody like this gets send:
"Rhe vulnerability allow’s facebook users to share posts to non friends facebook users , i made a post to sarah.goodin timeline and i got success post … of course you may cant see the link because sarah’s timeline friends posts shares only with her friends , you need to be a friend of her to see that post or you can use your own authority ."
You might mistake it for.
"You can post something on a friends page and you can't see it if you aren't friend with that person"