sherlock-project/sherlock
Hunt down social media accounts by username across social networks
What it does
Sherlock is a tool that takes a single username and automatically searches for accounts matching that name across more than 400 social media platforms simultaneously, returning a list of everywhere that username exists online. Think of it as a reverse people-search engine — you give it a name like 'johndoe123' and it tells you whether that person has accounts on Instagram, Twitter, Reddit, and hundreds of other sites.
Why it matters for PMs
With nearly 73,000 stars on GitHub, this tool reflects massive demand for digital identity investigation, which has direct implications for products in background checking, fraud prevention, hiring, and brand protection. Any startup building in the trust-and-safety, compliance, or online identity verification space should be aware that this capability already exists as a free, widely-used tool — meaning customer expectations for this type of search are already being set.
Early stage — limited signal data
Score updated Feb 18, 2026
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