AI‑Generated Content Surges in Long‑Form Posts on LinkedIn and X

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Approximately one‑quarter of long‑form social media posts are fully AI‑generated, and nearly half of those on Microsoft’s (LinkedIn) and Elon’s (X) platforms incorporate AI to some degree.

A recent study by AI detection firm Pangram indicates that social media, especially long‑form posts on LinkedIn and X, is saturated with AI‑generated content.

Pangram offers an AI‑content detection Chrome extension, available via a $20‑per‑month subscription that automatically scans LinkedIn, Medium, Substack, X, and Reddit feeds for AI‑generated or assisted material. Since its launch, over one million posts have been analyzed from users who opted in to share data.

Analyzing more than one million posts, Pangram concluded that AI‑generated content dominates long‑form posts, which are defined as any content exceeding 250 words.

According to the study, 25 % of long‑form posts across all examined platforms are entirely AI‑generated, excluding posts that are merely assisted by a large language model.

LinkedIn leads with 41 % of long‑form content flagged as AI‑generated, a figure that aligns with expectations for lengthy professional narratives on the Microsoft‑owned platform. A separate analysis by Originality.ai in late 2024 reported 54 % AI‑generated long‑form posts on LinkedIn, using a broader definition of long‑form (over 100 words).

Short‑form LinkedIn posts (50–250 words) are also heavily AI‑written, with 30 % fully generated by AI.

Only 4.3 % of LinkedIn long‑form posts are produced with AI assistance, while 55.2 % are authored entirely by humans.

X (formerly Twitter) trails LinkedIn in pure AI‑generated long‑form posts, with 25 % fully AI‑authored and an additional 23.2 % co‑written with AI assistance, leaving 52.7 % human‑written.

Medium shows a similar trend, with roughly one‑third of its posts authored or assisted by AI. Substack, by contrast, exhibits the lowest AI prevalence; only about 21.9 % of its analyzed posts are AI‑generated or assisted.

Reddit presents a more complex picture, as comments constitute a large share of its content. The study found 11.6 % of Reddit posts are AI‑authored or assisted, while 98.1 % of comments are human‑written, making Reddit a relatively low‑risk environment for AI intrusion.

Overall, Pangram determined that AI‑generated content is proliferating across social media, mirroring its spread on websites and elsewhere online.

Pangram CEO Max Spero remarked that a completely undisclosed AI‑filled internet is undesirable but not inevitable, and that informing users about AI‑generated material could mitigate the issue, although this capability is offered through a paid Chrome extension.

Thus, unless users subscribe to the extension, they should assume all content may be AI‑generated and consider disengaging from those feeds.

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