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Noun: astroturfing  'as-trow,tur-fing
  1. Simulation of grassroots support for something, esp. by a corporation or government
    "In August 2007 Comcast Corporation's public relations representatives were accused of astroturfing by posing as fans on internet college team message boards"
Noun: AstroTurf  'a-strow,turf
  1. (trademark) artificial grass turf used for sports fields

Encyclopedia: Astroturfing