Twitter's Recommendation Algorithm
From https://github.com/twitter/the-algorithm/blob/7f90d0ca342b92...    (
      "author_is_elon",
      candidate =>
        candidate
          .getOrElse(AuthorIdFeature, None).contains(candidate.getOrElse(DDGStatsElonFeature, 0L))),
    (
      "author_is_power_user",
      candidate =>
        candidate
          .getOrElse(AuthorIdFeature, None)
          .exists(candidate.getOrElse(DDGStatsVitsFeature, Set.empty[Long]).contains)),
    (
      "author_is_democrat",
      candidate =>
        candidate
          .getOrElse(AuthorIdFeature, None)
          .exists(candidate.getOrElse(DDGStatsDemocratsFeature, Set.empty[Long]).contains)),
    (
      "author_is_republican",
      candidate =>
        candidate
          .getOrElse(AuthorIdFeature, None)
          .exists(candidate.getOrElse(DDGStatsRepublicansFeature, Set.empty[Long]).contains)),
    )