Who is the most influent celebrity in your opinion?

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I think that so many people in the entertainment industry adopt a cause as a tool to publicize themselves. However, I believe Bono (U2) expressed his sadness and concern for his Native Ireland and other poor and opressed people around the world. So, I think he was living his faith before fame was his. For me he is the one. He is the most influent celebrity today. And for you?