I think you have a great point here. Other than documenting an event I cannot see any utility in sharing photographs with people in my immediate vicinity.
Boy sees a cute girl but can't work up the guts to talk to her. Boy notices she's taking pictures with Color and writes: 'will you go out with me' on a paper napkin. Boy takes picture of the napkin with Color. Girl sees the message but ignores him. Boy secretly keeps the photos she shared longing for his lost love till he's an old man. Camera pulls back to show his grandkids using Color.
Fin.