the search tool uses the locations of tagged persons to quantify relationships between them, even those not tagged in any given photo. Imagine you and your mother are pictured together, building a sandcastle at the beach. You’re both tagged in the photo quite close together. In the next photo, you and your father are eating watermelon. You’re both tagged. Because of your close ‘tagging’ relationship with both your mother in the first picture and your father in the second, the algorithm can determine that a relationship exists between those 2 and quantify how strong it may be.

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