I found other ways that YouTube comments have be reused, unlike Adam Buxton's stand up comedy style, these readings take a different approach. By using the comments as a script they have recreated these conversations into dramas, creating dramatic readings in a film like scenario.
The next set of videos I looked at is a campaign from a YouTube musician, to send him tweets of which he would on the spot create a song using them. Unedited words, parts working, parts clashing, but creating something that wouldn't have been written without this element of chance.
A lot of these channels use the instant nature of the internet to gather information, and also the memorable, entertainment value to get audiences to watch their videos, instead of others in a mass of YouTube videos.