# Study: ChatGPT, Claude, Grok, and Perplexity share data with third-party ad networks.

*genai · news · 2026-05-07 · Decrypt*

## Key points

- IMDEA Networks found ChatGPT, Claude, Grok, and Perplexity send data to ad and analytics firms.
- Grok's guest conversations are fully public by default, allowing anyone to access chats without login.
- Claude and ChatGPT transmit conversation URLs and ad cookies to Meta and Google via Anthropic's servers.
- Perplexity removed its Meta tracker only last month, after the study began.
- Researchers say none of the four platforms explicitly disclose the embedded trackers to users.

**Companies:** Meta, Google, OpenAI, Anthropic, xAI
**Countries:** United States

[Read the full story on Decrypt](https://decrypt.co/367164/your-ai-chatbot-leaking-chats-meta-tiktok-google)

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Canonical: https://newsio.io/n/f5f54df6-4b13-40ee-bc57-827a7e85ec89/study-chatgpt-claude-grok-and-perplexity-share-data-with-third-party-ad-networks
Summarized by Newsio from Decrypt. https://newsio.io/how-it-works