r/masskillers↗
MassKillers
A subreddit centered on the phenomenon of mass murder and the perpetrators who commit them, their motivations, crimes and the psychology of these individuals. This subreddit is not meant to glorify mass killers, but rather to discuss and attempt to understand their behavior. A mass killer is defined as one person who kills 3 or more individuals arbitrarily in a contained population at a single point in time. This includes mass shooters, bombers, terrorists, and family annihilators.
234k subscribers329 posts / mo in Sep 2026166 authors / mosince 2018
r/masskillers has 234k members (+11% over the last 12 months). It gets about 329 posts a month from 166 people. Top topics: School Shootings & Safety, School Shootings & Videos and Shooting Incidents.
When to post on r/masskillers
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How r/masskillers has grown
Subscriber growth
Subscribers over time
Monthly activity
Posts, comments and authors per month
Topics and brands on r/masskillers
Top topics
Share of the subreddit's posts
- School Shootings & Safety0.8%
- School Shootings & Videos0.6%
- Shooting Incidents0.5%
- Violence and Shootings0.5%
- Murder Arrests0.4%
Brands people mention
Most-mentioned brands and sites, last 12 months
- Archive
- CBC
- CBS News
- Go
- FBI Human Resources Branch
Everything else about r/masskillers
Posting rules and account requirements, how often posts get removed, who writes here (age, gender, countries), what people ask for, how they talk, and related subreddits — all in the full report.
Posts and activity for Sep 2026. Members from Reddit's subscriber counts. Read from the same data the app runs on. Our research