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Facebook has a simple but clever way of tracking who is engaged with their video advertisements. Video ads auto play in the background without audio, the user has to click on the video to get audio. Presumably they're then able to track engagement by the number of users who specifically choose to watch the video with audio..

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and in the process suck down a bunch of wasted bandwidth. I hate it when a site auto-plays any video (or long audio), since i want to choose to not expend the bandwidth, but the choice is taken away from me.

https://www.facebook.com/settings?tab=videos

Auto-Play Videos >> "Off"

If anyone from FB is here: I am ok with videos autoplaying, but if I then click to watch the video, please start it from the start. So many times I see something that looks funny, click it, and then all I get is the punch line as the video carries on from halfway through.

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