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I imagine the conversation going on the lines of:

Facebook: In the week we exposed the user to the add, the user posted a picture of your product. We made that sell for you!

Advertiser: Say no more, take my money!

Facebook: (smiles smugly)

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I seriously doubt there's that much detail. It would be dumb for FB to tell customers that something like this is a primary targeting criteria. That's the racket, that FB (probably) doesn't say, and if any customer is asking I can't think that FB would tell them, since it just results in wasting the customer's money.

It's like a conversation I saw last week, that video ads pay out to the provider/site even if the user only sees one second of it before pressing pause or the back-button.

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