| http://www.w3.org/ns/prov#value | - The aforementioned foursome and others are signing off Twitter and Facebook Tuesday until they raise $1 million for World AIDS Day.Keys' charity, Keep A Child Alive, is staging a campaign that will have celebs such as Lady GaGa, Justin Timberlake, and Usher signing off of all social media.PEACE OUT: Donate money or Usher will not be back on Twitter!The Digital Life Sacrifice will feature the stars'
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