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See a bot, say a bot: why we're building SynthStamp

Scroll any big subreddit for ten minutes and you’ll meet them. The account that posts a perfect sunset every morning and has never once replied to a comment. The reply that says “What a stunning capture! The interplay of light and shadow truly showcases nature’s beauty” under a photo of a parking lo

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How SynthStamp recognises a reposted image

A tag on an image is only useful if it follows the image. The AI-generated sunset tagged in r/pics on Monday will be back on Wednesday in another subreddit, resized, recompressed, maybe flipped. If SynthStamp only matched exact files, every copy would start from zero.

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Building a Reddit add-on: what Reddit's page taught us

SynthStamp’s add-on does something that sounds simple: find every username, post, comment and image on a Reddit page, and put a small flag next to each. Getting that right took most of the first week. These are the problems we hit, in case you’re building something that lives inside someone else’s p

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