One definition: "online comment threads and forums are being hijacked by people who aren't what they seem." [1] [1] http://www.theguardian.com/environment/geor

One definition: "online comment threads and forums are being hijacked by people who aren't what they seem." [1] [1] http://www.theguardian.com/environment/georgemonbiot/2011/feb/23/need-to-protect-internet-from-astroturfing http://www.theguardian.com/environment/georgemonbiot/2011/fe...