That video explains one aspect of the issue (the fake clicks), but what I found most troubling from the article was the five-fold discrepancy between the FB lin

That video explains one aspect of the issue (the fake clicks), but what I found most troubling from the article was the five-fold discrepancy between the FB link count and the Bitly and Google Analytics visitor counts. If anything, you would expect Facebook to be able to detect at least some of the fake ad clicks, so their count would be marginally less than Bitly and GA detected.