# Numbered thread formula Part of [The AI Tells Index](https://feedsquad.com/ai-tells). A tell signals low effort. It does not identify an author. Skilled writers produce every shape listed here, some of them daily, and automated detectors misread those writers for it at rates measured above 60 percent on non-native English prose. Nothing in this index proves that a machine wrote anything. Read an entry as one piece of evidence to weigh against the false-positive notes printed beside it. ## Facts - Id: numbered-thread-formula - Category: Platform-specific (platform) - Subcategory: post-shape - Also known as: 1/ 2/ sequencing, tweetstorm numbering - Status: Contested. Credible people dispute that this signals anything at all. - Severity: low - Evidence grade: corroborated (named independently by multiple credible secondary sources) - Languages: en - Added: 2026-08-15 - Updated: 2026-08-15 - Page: https://feedsquad.com/ai-tells/numbered-thread-formula ## Description Numbered sequential posts, the 1/ 2/ 3/ format. This entry exists mainly as a worked example of a tell that is not one. Marc Andreessen popularised the tweetstorm in 2014, a16z published its own collection of them, USA Today covered the format that April, and IndieWeb documented the numbering convention at the time. That is a decade before the current model era. ## Why it reads as machine-written It does not read as machine-written on its own, and the honest answer is that it reads as 2014. The numbering shows up in generated threads because it shows up everywhere in the corpus. What is worth checking is whether the numbers cover anything: a thread whose posts each carry a claim is a thread, and one whose numbering is the only structure is a list with delusions. ## Detection Type: deterministic (a regular expression, run as written) Scope: document ECMAScript regular expression. The build validator compiles it and tests it against this entry's own specimens. ```regex ^[ \t]*1\/(?:\d{1,2})?[ \t]+\S[^\n]*(?:\r?\n)+[ \t]*2\/(?:\d{1,2})?[ \t]+\S ``` Flags: m ## Examples Constructed specimens. Written for this index. Never quoted from anyone's posts. ### Specimen 1 Before, exhibiting the tell: > 1/ We rebuilt onboarding last quarter and it did not go the way we planned. > > 2/ First mistake was assuming the drop-off was inside the product. > > 3/ It was in the welcome email. After, repaired: > We rebuilt onboarding last quarter. The drop-off we spent six weeks chasing inside the product turned out to be in the welcome email, which went to spam for every Outlook address because a DMARC record was missing. Fixing the record recovered about a third of week-one activations. Note: The repair is not an argument against numbering. It is the same story with the finding moved to the front. Figures in this repair are invented for the specimen. ## False positives Who legitimately writes this way. Everyone who learned to write threads between 2014 and 2020 learned to number them, and the convention outlived its reason. Numbering is also genuinely useful on surfaces where posts arrive out of order or get quoted individually, which is why documentation threads and live-blogged conferences still use it. The reviewer check has nothing to do with the numbers: read whether each numbered post makes a claim, or whether the sequence is one thought spread thin. ## Model attribution No family attribution. Assistants emit the numbering when asked for a thread because the corpus is full of numbered threads written by people. ## Platform notes - x: X has never published anything about thread numbering. Its authenticity policy covers bulk and duplicative posting as behaviour, which is a different thing entirely. Nothing in the public algorithm repo keys on post format. ## Sources 1. a16z, the pmarca tweetstorm collection (2014) https://a16z.com/the-pmarca-tweetstorm-collection/ (tier: primary-doc; accessed 2026-08-14) 2. IndieWeb, tweetstorm https://indieweb.org/tweetstorm (tier: community; accessed 2026-08-14) 3. USA Today, Andreessen and the tweetstorm format (2014) https://usatoday.com/story/money/business/2014/04/01/andreessen-twitter-social-media/7180321/ (tier: press; accessed 2026-08-14) ## Status history Ids are permanent. A retired tell keeps its id and its page. - 2026-08-15, Contested: The format was invented by a named human in 2014 and documented contemporaneously by a venture firm, a newspaper and a community wiki. Publishing it as anything other than contested would be an error the rest of this directory exists to argue against. ## License CC BY 4.0. https://creativecommons.org/licenses/by/4.0/ Attribution: The AI Tells Index, feedsquad.com/ai-tells Reuse the data, including commercially. Keep the attribution line. --- Dataset version 1.0.0. Schema version 1. Part of [FeedSquad](https://feedsquad.com). Built by [Herman Foundry](https://hermanfoundry.com) from Levi, Finnish Lapland.