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Re:Facebook Overestimated Key Video Metric for Two Years by geon on Friday September 23, 2016 @06:34AM (#12563540)
You don't really.

But assuming the FB/Google reported numbers are accurate, would you pay for them and just convince yourself they are actually increasing your sales?

You should be able to at least plot sales numbers against ad spending per week over a year.

Re:Facebook Overestimated Key Video Metric for Two Years by ethanbond on Friday September 23, 2016 @08:37AM (#12564075)
Facebook also "should" be able to report numbers in a way that isn't misleading to their customers.