Before revision:  Reducing exposure to anti-social videos without deleting them therefore has the potential to improve quality across the information ecosystem, but additional transparency is needed to evaluate these effects further.
After revision:  Reducing exposure to anti-social videos within YouTube, without deletion, has potential pro-social, cross-platform effects. At the same time, increases in the level of conspiracy-channel sharing raise concerns about content producers' responses to these changes, and platform transparency is needed to evaluate these effects further.