Researchers found many job seekers are retroactively editing LinkedIn profiles to add AI skills, a behaviour the paper calls "time travel" and that appears aimed at signalling AI fluency to recruiters.
Nearly 1 in 5 established U.S. LinkedIn users edited a job title or description after leaving the role, the study found, with the median edit occurring 4.5 years after the job ended.
"We think it gives you a snapshot of what people think employers want," Nicholas Bloom, the William D. Eberle Professor in Economics at Stanford, said.
Mentions of AI surged on profiles after ChatGPT's debut, a change the researchers describe as a sharp uptick that spiked after late 2022, and some occupations showed concentrated rewriting, self‑described AI product managers edited older roles at a rate of roughly 70% in the sample.
The pattern looks behaviourally linked to job moves, the rate of retroactive edits doubles shortly before people change jobs, and sits alongside labour‑market pressure: nearly three‑quarters of employers now say AI skills are an advantage and AI mentions in job titles have more than tripled since 2022, the researchers note.
LinkedIn itself has been rolling measures to reduce low‑quality AI content, including a member "seems like AI slop" flag introduced on 6 August and stricter distribution limits on generic, machine‑produced posts.
