Before revision:  To assess this impact, we measure YouTube sharing in Twitter and Reddit  in the eight months around YouTube's announcement using interrupted time series models. These models evaluate YouTube's impact on sharing of videos from a curated set of alternative political channelsand popular videos shared in three conspiracy-oriented Reddit subreddits;
After revision:  To assess this impact, we measure YouTube sharing in Twitter and Reddit in the eight months around YouTube's announcement . We evaluate video sharing across three curated sets of potentially harmful, anti-social content: a set of conspiracy videos that have been shown to experience reduced recommendations in YouTube, a larger set of videos posted by conspiracy-oriented channels, and a set of videos posted by alternative influence network (AIN) channels. As a control, we also evaluate effects on video sharing in a dataset of videos from a curated set of alternative political channelsand popular videos shared in three conspiracy-oriented Reddit subreddits;