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Right on.

In other words, fb measures were correct for "people watching videos for 3 seconds or more". But they didn't: 1. Qualify their numbers with that. 2. Disclose how many people were NOT watching videos.

Without these two critical details, the numbers represented "all Facebook users".

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No, they were still incorrect for "people watching videos for 3 seconds or more." For that to be correct, the total view time (numerator in the figure in the article) would have to be view time only for those users who watched >3 seconds.

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