The internet is starting to feel like an echo chamber with no people in it. A Pew Research study released Thursday found that more than a third of web pages published after ChatGPT’s November 2022 launch show clear signs of being written or substantially edited by AI. That’s a stark jump from the roughly 10% AI authorship rate Pew detected in a broader random sample of 10,000 pages collected in July 2026 — a number dragged down by older, pre-ChatGPT content that couldn’t have been machine-generated.
Pew pulled nearly half a million English-language pages from the Common Crawl archive spanning five years, then ran them through Open Pangram’s detection technology. The 35% figure emerged only after researchers filtered out pages published before AI writing tools existed. The gap between the 10% overall rate and the 35% post-ChatGPT rate tells its own story: the web is bifurcating into a human-authored past and an increasingly synthetic present.
The domain-level breakdown is equally revealing. Commercial .com pages showed AI authorship at roughly ten times the rate of .edu and .gov domains, both of which hovered around 1%. Nonprofits sat in the middle at 4.6%. That spread tracks with economic incentives — .com sites are far more likely to be monetized through content volume, while .edu and .gov pages face institutional oversight and slower publishing cycles.
Pew also noted stylistic tells that have surged alongside AI authorship: em dashes, Oxford commas, and constructions like “it’s not X, it’s Y.” These aren’t proof on their own — plenty of human writers love an Oxford comma — but they’re the kind of patterns detection tools flag consistently. And the finding lands just as Cloudflare reported that bot traffic has overtaken human traffic on the web, sooner than the infrastructure company had projected. Bots reading what other bots wrote: that’s not a dystopian prediction anymore, it’s the current state of the measurable web. Pew acknowledges detection tools can misclassify pages, but at a scale of half a million samples, the directional signal is hard to dismiss.
