One camera for the whole room.
The Roll replaces sending photos back and forth after every trip and event. Start a Roll, share one link, and everyone who joins shoots into one shared album: tap for a photo, hold for an 8-second clip. Nothing gets sent around, and the album belongs to everyone on it.
Night mode keeps the album sealed until the big reveal at the end of the event, when every phone in the room buzzes at once. Session mode keeps the album live for a whole trip, with film that reloads daily. Either way, the album comes back as ready-to-post drafts: pictures picked, captions written, friends tagged. Groups can even publish a post together, from all accounts at the same minute.
Joining takes one tap on one sentence: everything shot on this Roll belongs to everyone on it. Anyone can hide any capture of themselves at any time.