ChatGPT ad targeting uses prompts, email, phone number, and cross-site tracking
Read original source →404media.co
404 Media ran test ads inside ChatGPT and found OpenAI lets advertisers target users by email address, phone number, or a device identifier, plus "context hints" tied to prompts. A separate teardown documents a __obi cookie set on .openai.com and sent back from advertiser sites, observed across 936 advertiser pixels on 1,029 hostnames.
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