
This is a GIF of a short (1 minute and 14 seconds) YouTube video's "Audience retention" section in Analytics. There's a graph with time on the x-axis and percentage of retained viewers on the y-axis, and it also displays the average view duration. The image is a GIF because the cursor hovers over "Audience retention" to show the following information: "How well your video keeps people watching. Viewership data for each moment of your video can help you to understand how to keep viewers engaged."
So according to this, YouTube tracks which seconds in a video people view.
I am extremely disturbed.
I see nothing about consenting to this kind of tracking in the Terms of Service. And, of course, there's nothing about whether this is purely information or if it impacts anything like whether the video is recommended to others.
This is CS, so I will limit my rant to just this.
On a slightly lighter note, I wish I saw this earlier, because this would definitely prompt some serious discussion among my classmates in one of my classes last semester.
(edit: just to clarify, I'm not surprised. But that doesn't mean I'm not disturbed.)











