> they can't do it any other way This is purely an extra data point; without it, there is 0 attribution for which user is responsible for a link to a video cau

> they can't do it any other way This is purely an extra data point; without it, there is 0 attribution for which user is responsible for a link to a video causing that video to go viral, besides the referrer header. They have experimented with other ways to do this in the past. For example, they used to have a direct friends list on YouTube where you could share videos to specific friends or groups of friends at once.