Russian roulette on Tinder

Always assume they're the one that's the least conventionally attractive.
Why the hell else would they use a group photo on a dating/hookup app?

Tinder allows someone to post more than one photo, so if all they post is groups, see which girl/guy appears in all of them. If it's just the one, assume the worst

Plottwist: it's the dude in the background

I'd assume it's the girl in the dead centre of photo