Machine Room · MX-029
She optimised the algorithm for watch time. Internal research showed it recommended radicalisation content. She kept the metric.
Lena Castellanos, the product owner of StreamCore's recommendation algorithm from April 2016 to March 2019, oversaw a system driving seventy percent of total watch time. After receiving a report showing that users were led to increasingly extreme conspiracy content, the team chose not to alter the core optimization metric.
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