OP gathering an army of anonymous strangers online for the sole purpose of raiding people's personal webspace with negative comments is commonly referred to as "Cyber bullying" and no, before you even hit reply, the fact they are not innocent parties does not stop it being bullying, nor does it justify the act.
As I've said numerous times when dealing with stupid, vengeful hypocrisy (a la "should we picket fred phelps's funeral?"), by doing exactly the same as the people you despise you are not only just as bad as they are, you are worse.
They do not have a problem with bullying, you do, so not only are you a bully, but you're a hypocrite as well.
Tell people in authority, preferably relevant adults, and be a friend to those being bullied. You are not batman, your idea of Justice is nothing but blind vengeance and you should seriously rethink your position.