I must say these are some of the most airtight arguments I have ever seen. These quotes are from the FAQ section that I found especially interesting.
"Q: 'NASA and other world space agencies have pictures of the Earth from space, and in those pictures the Earth is clearly a globe; in this day and age, hasn't it been proven beyond any doubt that the Earth is round?'
A: NASA and the rest of the world's space agencies who claim to have been to space are involved in a Conspiracy to keep the shape of the Earth hidden. The pictures are faked using simple imaging software."
"Q: 'Why has no one taken a photo of the Earth that proves it is flat?'
A: Only those connected to the Conspiracy have access to heights from which the shape of the Earth can be discerned. Also, nobody has been to the edge of the Earth and lived; conditions on the Ice Wall get increasingly treacherous the further you get out, and navigation methods become unreliable that far south. It is also possible that the Conspiracy is guarding the edge to prevent people from getting too close to the truth."
"Q: 'If you're not sure about the motive, why do you say there is a conspiracy?'
A: Well it's quite simple really; if the Earth is in fact flat, then the space agencies must be lying when they say it isn't."
Ahah! Millions of people are involved in this conspiracy and somehow not one of them has defected or put forth any information regarding the existence.
"Q: 'No one could possibly pull off such a conspiracy successfully.'
A: Actually, they could."
Well there ya go! Irrefutable evidence that such a large scale conspiracy can and is being pulled off.