If I were accused, anonymously, of pedophilia, I would not try to use the courts to find my accuser. Instead I would ignore the accusation unless it was repeated by an identifiable person, such as a reporter asking if it were true. I would answer the reporter by saying it was not, and offering to cooperate with the reporter's investigation into whether or not I was a podophile if he felt the accusation was credible enough to be worth the effort.
Reporter investigation? What's that?
No seriously for the most part investigations are a thing of the past. We live in a world where everyone is a live reporter themselves. An accusation gets made and moments later it hits twitter, Facebook etc, and millions of people know you as a paedophile. Then you come out through a reputable news agency and millions of people will think "Of course he says that, he's trying to hid the fact he's a paedophile!". When things go REALLY south you may even find reputable news agencies pick up what's making the round on twitter as fact, and then your Wikipedia page will have that listed as well complete with references to the media.
Anonymous Cowards can do a lot of damage in the modern media because the masses in general are stupid. Heck last week someone took a selfie of themselves against some poster, and some white knight though he was taking a snap of a child sitting further away, took his photo and it was shared several 10s of thousands of times on Facebook until someone AT HIS WORK mentioned it.