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In January 2019, YouTube announced it would exclude potentially harmfulcontent from video recommendations but allow such videos to remain on theplatform. While this step intends to reduce YouTube's role in propagating suchcontent, continued availability of these videos in other online spaces makes itunclear whether this compromise actually reduces their spread. To assess thisimpact, we apply interrupted time series models to measure whether differenttypes of YouTube sharing in Twitter and Reddit changed significantly in theeight months around YouTube's announcement. We evaluate video sharing acrossthree curated sets of potentially harmful, anti-social content: a set ofconspiracy videos that have been shown to experience reduced recommendations inYouTube, a larger set of videos posted by conspiracy-oriented channels, and aset of videos posted by alternative influence network (AIN) channels. As acontrol, we also evaluate effects on video sharing in a dataset of videos frommainstream news channels. Results show conspiracy-labeled and AIN videos thathave evidence of YouTube's de-recommendation experience a significantdecreasing trend in sharing on both Twitter and Reddit. For videos fromconspiracy-oriented channels, however, we see no significant effect in Twitterbut find a significant increase in the level of conspiracy-channel sharing inReddit. For mainstream news sharing, we actually see an increase in trend onboth platforms, suggesting YouTube's suppressing particular content types has atargeted effect. This work finds evidence that reducing exposure to anti-socialvideos within YouTube, without deletion, has potential pro-social,cross-platform effects. At the same time, increases in the level ofconspiracy-channel sharing raise concerns about content producers' responses tothese changes, and platform transparency is needed to evaluate these effectsfurther.

YouTube Recommendations and Effects on Sharing Across Online Social Platforms