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about this song
Pink has stated that "Who Knew" is about "the death of friendship. You're best friends forever, and then three years later you haven't seen each other in two years — what happened? You grow apart and people come in and out of your life for different reasons, seasons." She said in an interview with The Observer that the song was written about friends who died as a result of drug overdoses. According to her, the song is about more than one person: "There's a couple of different people mixed in .