Devin Coldewey. Study finds Reddit's controversial ban of its most toxic subreddits actually worked. TechCrunch, September 2017. URL:
This study was conducted by Georgia Institute of Technology. The finding was that because Reddit banned toxic subreddits in 2015, it successfully reduced hate speech on the platform by up to 80 - 90% among users. The article also shows that while many offenders migrated to other communities like Voat and Gab, they didn't significantly increase the amount of hate speech in the subreddits that they joined. Researchers of this study concluded that by making bigotry more difficult to practice, they can effectively discourages it and eventually yield lasting positive results.