user18258: How does Youtube decide that a video was "viewed"?
If a video is 5 minutes long and a viewer watches for 10 seconds, will this be counted as a view?

user6219: YouTube now have a Creator's Academy and I think they answer your question in this video: Why Subscribers Matter Basically, it matters how long a video is watched, this is measured. But a single view means a single "opening" of the video itself. (E.g., I can produce two views in a few seconds, but this won't matter so much to internal metrics other than views' count.)

18258: <p>How does Youtube decide that a video was "viewed"?</p>

<p>If a video is 5 minutes long and a viewer watches for 10 seconds, will this be counted as a view?</p>
 6219: <p>YouTube now have a Creator's Academy and I think they answer your question in this video: <a href="https://www.youtube.com/watch?list=PLpjK416fmKwTwoORQiQTZ9exUZPlmLCb5&amp;v=UMc7ag0WPE4" rel="nofollow noreferrer">Why Subscribers Matter</a> Basically, it matters how long a video is watched, this is measured. But a single view means a single "opening" of the video itself. (E.g., I can produce two views in a few seconds, but this won't matter so much to internal metrics other than views' count.)</p>
