On Tinder and similar dating sites, when trying to figure out who the appropriate person is in a group photo, always err on the side of the least attractive person.
Gary: How am I supposed to know which one she is? The only pictures she posted were group photos.

Tim: She is most likely the least attractive person in the group. It's Tinder's Law of Attraction.
by Dr.Daunt June 10, 2015
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