This may worry you, however last year the supreme court ruled anything said in a internet forum can not be used as evidence since it is intended for entertainment/eduacational use. This was spurred because a man said he was going to kill someone in a forum... then someone did it.. he was found guilty but then all his evidence was invalidated because of this ruling, then he was released. Take it for what you will but personally speaking as someone who has served such warrants, and then been a consultant in the private sector as a systems engineer, i wouldnt worry. How many IP addresses go here a day? thousands? hundreds of thousands? try linking one of those to an account, it wont happen.
But by all means if it suits you, then continue to be paranoid.