The first four pics hand gestures are the international symbol of "rock and roll", or "let's party", and initially the "devil sign", Pic 5 looks like they're doing the sign for "West Side" which started out as a gang signal, the bikini girls I have no idea, maybe they're on vacation and it means something where they are or means something in sign language, the girls in the formal dresses are probably doing a sign for their sorority (fraternities and sororities often have certain hand signals), and the others just look like different styles of peace signs.
Hope that helps.
Everlong
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