r/masskillers is a subreddit with 229k 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 plotted mass murder.
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
: "Photo of the bystander that engaged yesterdays active shooter in Twin Falls, Idaho making the shooter run away from the In n Out before he could kill more in the restaurant"
40 posts
#2
ON THIS DAY…
: "Today marks 14 years since James Holmes killed 12 people and injured 58 others at a Century 16 movie theater in Aurora, Colorado"
17 posts
#3
ATTEMPTED Mass Murder
: "Video from todays attempted bombing in Lower Manhattan showing a suspect attempting to set fire to a building and being taken into custody."
12 posts
#4
BREAKING
: "Video shows an armed civilian in a gunfight with the shooter during today's active shooter incident in Twin Falls, Idaho"
10 posts
#5
PLOTTED Mass Murder
: "Ilnaz Galyaviev the perpetrator of Kazan school shooting married his 18 y.o admirer in "Black Dolphin" prison"
8 posts
#6
FAMILICIDE / Domestic Violence
: "47-year-old Kristopher Karolkiewicz has been identified as the man who shot and killed his wife and 6 children at their home in Grand Haven Township, Michigan, before setting the house on fire and then committing suicide"
3 posts
#7
IN MEMORIAM
: "Ashley Garibay, 23, an employee of In-N-Out shooting in Idaho on saturday"
3 posts
#8
Breaking MEGATHREAD
: "Police say they are responding to an active shooter at an In-N-Out in Twin Falls, Idaho"
2 posts
#9
REPOST
: "An upscaled photo of the twin falls shooter."
2 posts
#10
FOIA
: "Photos of Elliot Rodger at a Katy Perry concert/party"
1 post
Member Growth in r/masskillers
Yearly
+25k members(12.3%)
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Last updated: August 6, 2026