Probably based on your IP (range). If 5 people from IP address X work at company... | Hacker News

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		wouterinho on Aug 12, 2013 \| parent \| context \| favorite \| on: You Might Have an Invisible Facebook Account Even ... Probably based on your IP (range). If 5 people from IP address X work at company Y, chances are you work there as well.

kamjam on Aug 12, 2013 [–]

This was long after (4 years) I had left the company in question, so nothing to do with IP range. Besides, it was a BIG company, and it fairly accurately found my colleagues that I worked most closely with.

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