YouTube Reaction Video

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Youtube Reaction Videos is an application in which people react to events.

In particular, videos showing the emotional reactions of people viewing television series episodes or film trailers are numerous and popular on video hosting services.

The depicted persons may or may not be aware that they are being recorded, and the video being reacted to may or may not be reproduced within the reaction video, allowing the reaction video's viewers to see directly what is being reacted to.