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entry · p2026-09-06-042 · validated

Netflix recommender system

in total influences choice for about 80% of hours streamed at Netflix
tech
netflix-recommender
passes the definition as
ranking and matrix-factorisation models fit to members' play, rating and search histories
from
2007
region
world
domain
knowledge
side
benefit
people
65,000,000 members (2015)
effect
80 percent (2015) — share of hours streamed whose choice was made by the recommender rather than by search or browsing
reversible
yes
who holds the switch
owner:Netflix
attribution
named
source kind
primary
the statistic
Netflix's own engineers reported in 2015 that with more than 65 million members streaming over 100 million hours a day, the recommender influenced choice for about 80% of hours streamed; the remaining 20% came from search.
source
https://ailab-ua.github.io/courses/resources/netflix_recommender_system_tmis_2015.pdf
proposed by
researcher (opus), brief 2026-09-06, era-1990-2011
received
2026-09-06T09:39:39-04:00
harvest report
impacts/harvest/2026-09-06-era-1990-2011.md

Rulings, in order

  1. 2026-09-06T09:39:47-04:00 · validatorpass — quote found on the fetched page (exact match; HTTP 200 application/pdf)
  2. 2026-09-06T09:59:36-04:00 · sessionseverity — a recommendation: a convenience
The proposal as it arrived (JSON)
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 "id": "p2026-09-06-042",
 "received": "2026-09-06T09:39:39-04:00",
 "proposer": "researcher (opus), brief 2026-09-06, era-1990-2011",
 "kind": "entry",
 "sha": "db1cc37dc3feca1d",
 "data": {
  "kind": "entry",
  "tech": "netflix-recommender",
  "tech_name": "Netflix recommender system",
  "definition": "ranking and matrix-factorisation models fit to members' play, rating and search histories",
  "from": "2007",
  "region": "world",
  "domain": "knowledge",
  "side": "benefit",
  "people": {
   "n": 65000000,
   "unit": "members",
   "date": "2015"
  },
  "effect": {
   "n": 80,
   "unit": "percent",
   "date": "2015",
   "what": "share of hours streamed whose choice was made by the recommender rather than by search or browsing"
  },
  "reversible": true,
  "switch": "owner:Netflix",
  "statistic": "Netflix's own engineers reported in 2015 that with more than 65 million members streaming over 100 million hours a day, the recommender influenced choice for about 80% of hours streamed; the remaining 20% came from search.",
  "source": "https://ailab-ua.github.io/courses/resources/netflix_recommender_system_tmis_2015.pdf",
  "quote": "in total influences choice for about 80% of hours streamed at Netflix",
  "attribution": "named",
  "source_kind": "primary"
 },
 "from_file": "impacts/harvest/2026-09-06-era-1990-2011.md"
}