Unfortunately, no tool is going to provide this kind of info, and the reason is that only Facebook knows why they show a certain ad to a certain user.
If user x sees an ad, it could be (among other many reasons):
– He/she is a returning visitor
– He/she is part of a customer list
– He/she is part of a LLA of a customer list
– He/she visited a certain url
– He/she is similar to other buyers from Pixel X
– He/she is considered under certain interest by FB
And the list goes on and on, but the thing is, Facebook won’t let us know why it was shown.
However, you can get tons of other info using Spy Hero to get converting ads and landers; the part about the targeting is up to you, but if you follow Robby’s teachings (start with LLA audiences, then interests, and when you have 50+ sales on your pixels build a LLA of that pixel) you should find good audiences.