Privacy Mirror

A browser plugin that we designed to help users of online platforms maintain their anonymity when sharing online.

Currently works with Reddit!

Drafting a post on Reddit: title, subreddit, and body.

Draft your post

After downloading the plugin, open the post drafting page on Reddit and type up the post that you are hoping to make, and input the title and subreddit.

Scan your post for privacy risks

Open the Privacy Mirror plugin, and click “scan post”! From there, we’ll estimate your population risk (how many other people the details you included could apply to), and suggest ways to mitigate your privacy risks, while maintaining the original intention of your post!

Reddit create post with Privacy Mirror overlay showing a high-risk privacy report.
Privacy Mirror: low-risk privacy report when a post is ready to share.

Repeat until you are ready to post

After editing the privacy risks in your post, you can rescan it and repeat the process until you’ve either eliminated the risks, or reached a comfortable threshold.

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About us

Researchers @ CMU’s HCII & Georgia Tech

With so many AI technologies being developed to re-identify internet users on anonymous or pseudonymous online platforms, we wanted to flip the script and see whether we could use this same technology to help people protect themselves from being de-anonymized!

Privacy Mirror is a human-centered tool we built with the goal of empowering users to continue to engage in online discourse and support seeking while avoiding the threat of re-identification.