LinkedIn has become the most AI-saturated major social media platform, according to new research from AI detection company Pangram Labs.
The study found that around 41% of long-form LinkedIn posts were likely written entirely by artificial intelligence. Researchers classified posts containing more than 250 words as long-form content.
Pangram collected data through its AI detection Chrome extension. Users who agreed to participate anonymously shared information about posts appearing in their social media feeds.
The company analysed 1,002,627 posts from LinkedIn, X, Reddit, Medium and Substack. It collected the data after launching the extension on April 24, 2026. The tool only scanned posts containing more than 50 words.
LinkedIn posts represented roughly one-third of the material analysed. However, they accounted for 62% of all content that Pangram’s system flagged as AI-generated.
The study also estimated that 30% of shorter LinkedIn posts were likely AI-generated. This gave LinkedIn the highest overall AI content rate among the five platforms included in the analysis.
The problem was not limited to LinkedIn. Across all five platforms, Pangram flagged 13.8% of scanned content as fully AI-generated.
However, the rate increased sharply for longer posts. Around 25.72% of all posts containing more than 250 words were classified as entirely AI-written. In other words, approximately one in every four long-form social media posts may have been generated by AI.
X also recorded a high rate of AI-written content. Pangram classified 23.9% of long-form X articles as fully AI-generated. Another 22.9% contained a mixture of human and AI writing. Therefore, nearly half of the long-form articles appearing on X showed some level of AI involvement.
Substack performed better than the other long-form platforms. Still, 21.9% of its scanned posts were flagged as either AI-generated or AI-assisted.
Meanwhile, Reddit recorded one of the lowest combined AI rates at 4.4%. Pangram said Reddit’s large number of human-written replies helped reduce its overall percentage.
Pangram found that a main LinkedIn post was 1.35 times more likely to be AI-generated than a comment.
However, the difference partly reflected post length. After adjusting for length, LinkedIn comments were slightly more likely to contain AI writing than main posts.
The researchers said the findings were surprising because LinkedIn users normally publish under their real names and professional identities. Despite this, users appeared more willing to let AI speak on their behalf on LinkedIn than on more casual or anonymous platforms.
LinkedIn has already acknowledged the growing amount of low-quality AI content on its platform.
The company defines “AI slop” as low-effort content that may sound polished but lacks original ideas, expertise or a genuine personal perspective. LinkedIn has started developing systems to reduce the reach of generic posts, automated comments and repetitive material.
However, LinkedIn does not oppose every use of artificial intelligence. The platform says members can use AI to improve their language. Still, posts and comments should represent the user’s own experiences and opinions.
The professional networking platform also offers an “Enhance post” feature that helps users rewrite or polish their posts with AI.
Pangram said its latest detection model has a false-positive rate of 0.01%. However, the results remain estimates produced by an AI detection system rather than confirmed records showing how every post was created.
The dataset also came from people who installed Pangram’s extension and voluntarily shared their scanning information. Therefore, the sample may not perfectly represent every LinkedIn user or every piece of content published on the platform.
Still, the findings show that AI-generated writing now forms a significant part of the content people encounter online. They also highlight the growing challenge social platforms face as they try to separate useful AI-assisted writing from repetitive, automated and low-value content.
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