LinkedIn is the undisputed king of long-form AI slop, according to a study spanning five platforms

A study by Pangram found that one in four social media posts over 250 words is AI-generated, with LinkedIn leading at 41 percent. The analysis, covering over one million posts across five platforms from April to June 2026, suggests LinkedIn accounts for nearly two-thirds of detected AI content despite making up only a third of posts. Substack had the lowest rate at around 10 percent, while Reddit replies were 98 percent human-written.