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. 2020 Apr 20;7(4):e17188. doi: 10.2196/17188

Table 3.

Most important forums in each cluster, according to the strength of the latent factors identified by nonnegative matrix factorization. Cluster titles are suggested by the authors.

Cluster (Title) Subreddits
Cluster 1 (Depression)

  • r/depression

  • r/depressed

  • r/misanthropy

  • r/disability

  • r/selfharm
Cluster 2 (Leisure)

  • r/funny

  • r/weddingplanning

  • r/pics

  • r/Atlanta

  • r/gifs
Cluster 3 (Other)

  • r/3amjokes

  • r/NoStupidQuestions

  • r/satanism

  • r/findareddit

  • r/Lightbulb
Cluster 4 (Gaming)

  • r/leagueoflegends

  • r/summonerschool

  • r/TeamRedditTeams

  • r/LeagueConnect

  • r/formula1
Cluster 5 (Music)

  • r/shittyideas

  • r/PipeTobacco

  • r/Showerthoughts

  • r/Blink182

  • r/ToolBand
Cluster 6 (Young males)

  • r/ForeverAlone

  • r/virgin

  • r/NEET

  • r/AnxietyDepression

  • r/Fuckthealtright
Cluster 7 (Multimedia)

  • r/GifSound

  • r/Supernatural

  • r/HFY

  • r/dvdcollection

  • r/FlashTV
Cluster 8 (Teens)

  • r/teenagers

  • r/SonicTheHedgehog

  • r/nukedmemes

  • r/fakealbumcovers

  • r/nin
Cluster 9 (Gaming)

  • r/Warthunder

  • r/hoi4

  • r/pumparum

  • r/shittydarksouls

  • r/darksouls3
Cluster 10 (Illicit drugs)

  • r/opiates

  • r/Stims

  • r/OpiatesRecovery

  • r/benzodiazepines

  • r/trees