Reletter

Popular Links Shared by Newsletter Writers

Ten widely shared links a week from 7m+ newsletters on Substack, Beehiiv, Kit, Ghost and LinkedIn, picked to cover a balanced mix of topics.
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September 19–25, 2026

This week newsletter writers shared Dario Amodei’s “We Must Pace the Frontier” more than anything else. They also linked to TypeSafe AI’s introduction to System One Models and Jev, and OpenAI’s framework for reporting model misalignment. CNN’s report on a US military close call involving false AI intelligence was widely cited too.

  1. We Must Pace the Frontier
    darioamodei.com·179 mentions
  2. Introducing System One Models & Jev
    typesafe.ai·119 mentions
  3. Federal Reserve issues FOMC statement
    federalreserve.gov·50 mentions
  4. Introducing Claude Opus 5.5
    anthropic.com·45 mentions
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Past Weeks

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How is this list put together?

Every week Reletter extracts the outbound links from the newsletter issues published across 7m+ newsletters. Links are cleaned up so the same page only counts once (tracking parameters are stripped and redirects unwrapped), then ranked by how many distinct newsletters cited them, so a single newsletter repeating a link cannot push it up. From the top of that ranking we pick ten: the week's biggest story first, then widely shared links on other topics, from politics and the economy to science, sport and the arts.

Why not just show the top of the ranking?

A few subjects take up most of the raw ranking. In a typical week most of the top links are about AI, so a straight top ten would show the same subject over and over. Picking across topics shows the breadth of what newsletters were reading. Every link here was still widely shared, and each one shows how many newsletter issues mentioned it.

What links are left out?

Links from a newsletter to its own site, sharing and subscribe buttons, images and other boilerplate are excluded. So are sponsor links that repeat across most issues of the same newsletter, since those are paid placements rather than citations.

When does it update?

A new list is published every Friday evening covering the week from Saturday to that Friday. Once published, each week is frozen and stays available on its own page.

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