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Comment on How does Facebook know who I interact with offline?

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Have you both checked in on Facebook at the swimming pool? You might have also used Facebook multiple times at the pool, where they geolocate you, and then find people that have similar geolocation at same time, same place?

Valid point. But then there are close to 100 kids there at the same time. So about 100 parents checking Facebook at the same time. Why only him?

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