LinkedIn leads in AI‑generated long‑form posts, study shows

A Pangram analysis of more than 1 million public posts across five platforms – LinkedIn, Medium, X (formerly Twitter), Substack and Reddit – found that LinkedIn has the highest share of AI‑generated long‑form content. For posts exceeding 250 words, 40.5% were classified as completely AI‑written and another 4% as mixed, while only 55% were identified as fully human. Although LinkedIn accounts for roughly one‑third of the total content examined, it contains 62% of all AI‑generated posts. The study, which used the Pangram 3.3 detection model with a reported false‑positive rate of 0.01%, notes that AI usage rises with text length, and that even comments on LinkedIn show a slightly higher AI probability than short posts on other platforms.