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Reddit banned r/Honkler on July 2, 2019, days after r/Frenworld, for using clown-Pepe 'Clown World' memes as a vehicle for coded neo-Nazi and antisemitic content.
Reddit quarantined the subreddit for IRL streamer Ice Poseidon in September 2018 for bigotry and abuse, then banned r/Ice_Poseidon and r/Ice_Poseidon2 in October 2019; the community was notorious for swatting, doxxing, and stream-sniping.
In January 2019 Reddit removed r/Jakolandia, a Philippine-based community, after Filipino news outlets and users exposed it for circulating sexualised images of women — including celebrities and private individuals — taken and shared without consent, a case that drew national attention in the Philippines to Reddit's handling of image-based abuse.
On March 15, 2019, within hours of the livestreamed Christchurch mosque shootings, Reddit permanently banned the long-running r/WatchPeopleDie (300,000+ subscribers) and r/gore communities after users shared footage of the attack, citing its policy against glorifying or encouraging violence.
Reddit banned r/frenworld on June 20, 2019 for glorifying or encouraging violence, after the cartoon-frog 'fren' aesthetic was found to mask an economy of coded neo-Nazi and antisemitic dogwhistles.
After cyclist Susan Rainwater was killed in a 2018 hit-and-run in Washington State, a trooper posted a photo of a broken plastic fragment to Reddit's r/WhatIsThisThing; a user identified it as a part from a 1980s Chevrolet pickup, helping narrow the search to a suspect who later pleaded guilty.
Brian Parker ran internet research-chemical operations selling synthetic opioids and used a Reddit presence for customer contact; after a 2016 shipment of U-47700 was tied to an overdose death, he and a co-defendant were charged in 2017 and pleaded guilty in 2018.
After Reddit banned its deepfake-pornography community in 2018, the activity migrated off-platform and coalesced into MrDeepFakes, which grew into one of the largest deepfake-abuse sites before its 2025 collapse — a case study in how a ban can displace rather than end harm.
A large-scale study measured how antisemitic rhetoric and imagery escalated after political flashpoints on fringe boards and spread toward mainstream platforms, including Reddit, providing a sourced map of online hate diffusion.
On September 12, 2018 Reddit banned r/GreatAwakening — the largest QAnon hub — and roughly 18 related subreddits for inciting violence, harassment, and doxxing.
Reddit banned r/MillionDollarExtreme — the community tied to Sam Hyde's comedy troupe — on September 10, 2018 for violating its violent-content rules, two days before the QAnon sweep.
In August 2018 Reddit removed roughly 143 accounts linked to an Iran-aligned inauthentic news network exposed as 'Liberty Front Press,' which had seeded Iran-friendly content into political subreddits.