That's the IAB's standard viewable impression metric: https://www.iab.com/wp-con... | Hacker News

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swish_bob on Sept 23, 2016 | parent | context | favorite | on: Facebook Overestimated Key Video Metric for Two Ye...

That's the IAB's standard viewable impression metric: https://www.iab.com/wp-content/uploads/2015/06/MRC-Viewable-...

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