If you say you will pay 500Bucks per Bug reported, you will have a huge Fail rate, even if the Facebook Support is well Motivated after 3hours working, answering to 100Tickets you might not be able to understand something written in that way:
"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 ."