Unlike Polis, Twitter’s project has to find consensus not for one question at a time but for any conceivable controversy on the platform. Community Notes does that by estimating the diversity of viewpoints among participants, based on how different users rate the helpfulness of notes from others. Twitter’s version of bridging the divide is to find notes considered useful by raters who don’t usually agree on much, suggesting they have different viewpoints. This technique at the heart of Polis and Community Notes is called bridging-based ranking. Megill believes Twitter’s team has taken it to new technical heights. “Birdwatch has made a profound
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