Scores by kind of claim
Each kind of claim is scored on its own, out of 100: the share that held up, with the range it likely falls in. Fewer resolved claims give a wider range.
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Factual claims
Statements about the present or the past, checked against the record: did they hold up?
80 72 88 -
Predictions
Statements about events outside the person's control, checked once they fell due: did they come true?
70 62 78 -
Promises
Commitments to the person's or organisation's own future action, with something to deliver: was it delivered?
Insufficient record: 2 promises resolved, 5 needed for a score.
All types combined: 75 (likely 69 to 80, high confidence), from 79 claims: 35 factual claims, 44 predictions. It mixes kinds of claim in different proportions for different people, so compare people kind by kind.
Scott Alexander's claims
39 claims
“Friend of the blog Goodheart Labs is working on Common Notes, aka “Twitter Community Notes, but for everything”.”
Scott Alexander, ACX author 19 October 2026 Open Thread 456 (Astral Codex Ten)
Goodheart Labs is working on Common Notes, described as Twitter Community Notes but for everything.
Resolved true The record shows it happened or was so.
What would count as true or false
Judged as of 2026-10-19. True: on that date, Goodheart Labs was building a project called Common Notes, described as a general-purpose Community Notes-style system, that is, community notes for content beyond Twitter/X. Mostly true: Goodheart Labs was working on such a project, but its name or description differs slightly. Mixed: the project existed but was not run by Goodheart Labs (for example, a collaborator led it), or it had been stopped. Mostly false: Goodheart Labs had a related project, but it does not match the description. False: Goodheart Labs had no such project.
Evidence
- Goodheart Labs · 27 November 2023
“Community Notes for everything: a browser extension. Our claim-checking pipeline produces notes on Substack articles and YouTubers that are regularly visited by our users and displays notes directly on the page.”
- Goodheart Labs · 27 November 2023
“Common Notes, our browser extension, brings the same technology to Substack and YouTube.”
Reasoning
Goodheart Labs' own homepage names Common Notes as its browser extension, which brings its Community Notes technology to Substack and YouTube (E2). It describes the project as "Community Notes for everything", with notes shown on Substack articles and YouTube pages (E1). That matches the claim's name and its description as general-purpose Community Notes beyond Twitter/X. The page is independent of the subject, Scott Alexander. Its listed date (2023-11-27) does not pin down timing exactly, but it presents the project as ongoing and gives no sign it had stopped.
Cite this claim
Scott Alexander, “Goodheart Labs is working on Common Notes, described as Twitter Community Notes but for everything.” (said 19 October 2026). Verdict: resolved true. Reliability API, claim c_0a852ce07b07, method 0.1.0+8bea457b. https://epistacklabs.com/claims/c_0a852ce07b07
Claims without a verdict
Is a verdict here wrong, or do you speak for Scott Alexander? Reply on the claim's own page, with the form at its foot (how replies work). Verdicts are made automatically; how verdicts and scores are made.