r/masskillers is a subreddit with 226k members. The community frequently discusses mass shootings, people, shooting, shootings, and killed, and they frequently recommend/review true crime youtube channels, and the most common flair used is discussion / question , on this day…, attempted mass murder, breaking, and in memoriam.
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.
Popular Topics in r/masskillers
#1
Mass Shootings
25 posts
#2
People
21 posts
#3
Shooting
18 posts
#4
Shootings
17 posts
#5
Killed
16 posts
#6
Killings
14 posts
#7
Shooter
13 posts
#8
Man
9 posts
#9
Police
9 posts
#10
Video
8 posts
Products Discussed in r/masskillers
True Crime Youtube Channels
6 reviews
#1
Dreading
5.0★ from 2 reviews
#2
Explore With Us
4.0★ from 1 review
#3
Matt Orchard
4.0★ from 1 review
Flair Used in r/masskillers
#1
Discussion / Question
: "My theory as to why Austin Thompson and Charles Gillard failed in their suicide attempts."
49 posts
#2
ON THIS DAY…
: "Today marks 4 years since the Robb Elementary School Shooting in Uvalde, Texas."
22 posts
#3
ATTEMPTED Mass Murder
: "Photos of the helmet that an 11-year-old Italian boy wore during his mass stabbing attempt"
13 posts
#4
BREAKING
: "[ALLEGED] Images of Cain Clark, Identified as One of the Two Shooters at the Islamic Center of San Diego"
10 posts
#5
IN MEMORIAM
: "The three victims of yesterday's attack at the Islamic Center of San Diego. May they rest in peace."
8 posts
#6
FAMILICIDE / Domestic Violence
: "Yesterday restraunt owner Matthew Mitchell shot dead his wife Thy Mitchell and his 2 kids before killing himself in the River Oaks neighborhood in Houston Texas"
6 posts
#7
Breaking MEGATHREAD
: "At least 1 other person injured after man randomly fires at passing vehicles in Cambridge, Massachusetts, before being shot by police"
5 posts
#8
PLOTTED Mass Murder
: "Police believe they thwarted a potential mass shooting after a 22-year-old University of Washington Tacoma student posted a photo of a shotgun with "Elliot Rodger was right" engraved on it to Discord. Police later found the gun buried with the phrase scratched off."
5 posts
#9
FOIA
: "Photograph of a handwritten note by Elliot Rodger prior to the Isla Vista attacks, recovered from his motel room."
4 posts
#10
New Official Information
: "Cristian Fajardo Mondragon, one of the three suspected perpetrators of a shooting spree that occurred over the weekend in Austin, Texas"
2 posts
Member Growth in r/masskillers
Yearly
+25k members(12.2%)
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Last updated: June 21, 2026