Community Notes only shows a note when people who have historically disagreed agree that it is valid.

Judge as of 30 Dec 2024, using X's Community Notes documentation and open-source algorithm. TRUE: notes are shown publicly only after reaching 'helpful' status through a 'bridging' requirement, under which raters who have historically rated differently (contributors with differing perspectives, inferred from their rating history) must both rate the note helpful, and there are no material ways around this. MOSTLY TRUE: bridging is the main rule for showing a note, but there are minor qualifications, e.g. it is done by matrix factorization rather than an explicit 'agreement' check, or there are small exceptions or supplementary scoring paths that are themselves still based on bridging. MIXED: bridging applies, but notes can also be shown through significant other routes that do not require agreement across perspectives. MOSTLY FALSE: diverse-perspective agreement is only a minor factor, and most notes are shown on other grounds. FALSE: notes are shown on simple majority or volume of ratings with no requirement for agreement across differing perspectives.

Set before the research began.

1. E1 communitynotes/documentation/index.md at main · twitter/communitynotes GitHub (X's official Community Notes repository) Own record

   “Community Notes doesn't work by majority rules. To identify notes that are helpful to a wide range of people, notes require agreement between contributors who have sometimes disagreed in their past ratings. This helps prevent one-sided ratings.”

2. E2 communitynotes/documentation/under-the-hood/ranking-notes.md at main · twitter/communitynotes GitHub (X's official Community Notes repository) Own record

   “Matrix factorization identifies notes that are liked by people who normally disagree by assigning high intercepts to notes when users with different factors rate the note Helpful.”

3. E3 The Making of Community Notes Asterisk · 1 November 2024

   “What the algorithm does is find notes where people who've disagreed on their ratings in the past actually agree that a particular note is helpful.”

4. E4 Community Notes - Wikipedia Wikipedia

   “The threshold of five requests within 24 hours would determine a note being published.”

X's own Community Notes documentation says notes need agreement between contributors who have sometimes disagreed in their past ratings, and that the system does not work by majority rule (E1). An independent account describes the algorithm the same way (E3). The algorithm documentation shows this bridging is done by matrix factorization, which gives high scores to notes rated helpful by users with different factors (E2), rather than by a direct check that both sides agree. That is the minor qualification the criteria list under mostly true. E4 mentions a threshold of five requests, but the quote does not say this route lets a note be shown without bridging, so it does not show a significant other path.