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This is solid research, Mark. We've been building on the data side of this exact problem -- scraping 7,000+ career pages across 22 ATS platforms, scoring 125K+ listings.

Few things we're seeing that back this up:

The Greenhouse 18-22% ghost job number is probably conservative. When we score listings at the individual company level, it's bimodal -- most companies are either clean or terrible. Some have 60%+ stale listings sitting there for months. The average hides how bad the worst offenders are. We also stumbled onto something unexpected. Job postings leak corporate events before the press does. When executives leave, companies panic-post identical senior roles in 48-72 hour windows. We caught xAI's cofounder departures from their career page 5 days before any reporter covered it. Six identical "Member of Technical Staff" roles in 48 hours, across exactly the teams that lost leadership. The career page is the most honest page on a company's website. PR can spin a press release. They can't fake a hiring pipeline.

Wrote up the methodology and the full xAI case study here if you or anyone else wants to dig in: https://thesubspace.io/blog/backfill-burst-detection

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