Privacy Policy

1. Overview

FactCheck for X is a browser extension designed to provide in-context fact-checking and evidence retrieval for public posts on X (Twitter). We believe in privacy by design and data minimization.

2. Data We Process

The extension only activates when you explicitly click the "Fact-check this post" button on a public post:

• Post Content: When you trigger a check, the public text of the selected post is sent to our verification API.
• PII Scrubbing: Before any text is processed by language models, sensitive personally identifiable information (phone numbers, emails, credentials) is automatically scrubbed and redacted.
• Zero Account Tracking: We do not collect names, email addresses, passwords, IP tracking identities, browsing history, or cookies.

3. Permissions Used

• host_permissions (x.com, twitter.com): Required solely to read the public text of the tweet you choose to verify and render the inline verdict card. The extension never inspects other websites or unselected elements.
• host_permissions (*.run.app, localhost): Required to send verification requests and receive real-time streaming evidence from the FactCheck backend.
• storage: Used locally in your browser to remember your chosen API endpoint (e.g. Cloud Run or local server).

4. Data Sharing & Third Parties

We do not sell, rent, or monetize user data. Public claim text is checked against web search engines (e.g. Tavily, Brave, DuckDuckGo) and verified using inference providers solely to retrieve evidence citations.

5. Data Retention & Security

Requests are processed in real time. We do not store personal profiles, user identity records, or search histories. Anonymous verification cache entries expire after 24 hours.

6. Contact

If you have questions regarding this privacy policy or wish to report an issue, please reach out via our web application at https://fact-check-475370877423.us-central1.run.app/ui/.