*cough*Ponzai scheme.
Theres no real way to get a FREE ps3, its simply too good to be true.
Most sites require you to signup for offers that usually cost money, then make you refer 5-10 other people to do the same, and only once those 5-10 other people complete their offers (and maybe refer 5-10 other people each), do you get your item.
Ponzai scheme.