What PC? are you suggesting I am using a PC? Theres a big world out there dear.. not everyone uses a PC
You can use a PC or laptop and a mobile phone.. using a throw away chip (8 quid) you can be utterly and completly anonymouse on the internet... Its impossible to prove who is sat at a computer.. thats if they can find that computer.... you have to find it first.
I can be found easy... I use a fixed IP ... but I dont need to and the concept is there that you can be 100% anon and say what ya like.. so lol all ya like... I know my stuff