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The light inside is broken, but I still work. The Cadillac of online bookmarking sites. Alleged nocoiner. http://pinboard.in  maciej@ceglowski.com +1 415 610 0231

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    1. Guy Rosen‏Verified account @guyro 6 May 2019

      Guy Rosen Retweeted

      1/ The amount of bad things *taken down* is just one piece of the puzzle. The other really important piece is how much was *left up* i.e. got through. We've been measuring (and publishing) this using a metric called "prevalence". https://twitter.com/alexstamos/status/1125583226662047746 …

      Guy Rosen added,

      This Tweet is unavailable.
      6 replies 8 retweets 38 likes
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    2. Guy Rosen‏Verified account @guyro 6 May 2019

      2/ For fake accounts, prevalence measures what % of active users are fake. This is similar to how for air quality, regulators care about the concentration of pollutants, like what % of air is NO2.

      3 replies 1 retweet 5 likes
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    3. Guy Rosen‏Verified account @guyro 6 May 2019

      3/ Like periodic smog tests for air quality, we calculate this metric by periodically sampling active accounts and manually labeling how many of them are fake. We can then statistically estimate what overall % of active accounts are fake.

      3 replies 1 retweet 8 likes
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      Pinboard‏ @Pinboard 6 May 2019
      Replying to @guyro

      Is the parallel to air quality warranted? With air quality, you have physical laws about diffusion, models of pollution etc. that give you confidence your sampling is representative. How do you do this in an online context, where there may be concentrated pockets of bad activity

      10:20 PM - 6 May 2019
      • 1 Like
      • Roy Adams
      1 reply 0 retweets 1 like
        1. Guy Rosen‏Verified account @guyro 7 May 2019
          Replying to @Pinboard

          More on the sampling methodology here (around p30+) https://newsroom.fb.com/understanding-community-standards-enforcement-report …

          0 replies 0 retweets 1 like
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