From the weekly letter · 2 November 2026

Why cover this story this week?

AI text spreads unevenly across the web

An analysis of more than 5 million crawlable webpages finds a rapidly growing but uneven presence of AI-generated text. English-language pages were more likely to contain it than pages in other languages, and prevalence was lower on .gov and .edu domains than on .com. Growth was strongest among pages least central to the web's link network; the most central tier became the least likely to contain AI-generated text.

The researchers used multiple detectors and a Bayesian hierarchical model that accounts for false positives, false negatives and differences in detector performance between groups. That matters because an apparent difference in AI use could otherwise be a difference in detection reliability. The results describe the crawlable web rather than all online communication, and their estimates retain uncertainty from imperfect detection. They suggest that assessing AI's influence on public information requires asking where the text appears, not merely how much exists.

Editorial context written by AI from abstracts, not independent scientific validation. The kit and its verified quotes rely on the source paper, not on this letter.

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