A street photographer is someone who photographs people in public places, looking for human interest, irony and humor becauase an inner muse compels them to. A paparazzo is someone who photographs celebrities and other public personalities in ways that will embarrass them and tries to sell those pictures for a lot of money.
I love street photography and support street photographers worldwide. Can't say the same for paparazzi. Now it turns out a paparazzo who got his foot run over by Britney Spears and sued her for damages has lost his case. The D.A. wrote "the only way the victim's foot could have been [run over] was by the victim placing it in that location." Of course he was standing there to get a salable shot.
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