All this talk about responsibility responsibility and Wikipedia has confused me. The situation seems like a house of mirrors with all these people making conflicting claims about the chain of responsibility or lack there of.
Maybe we need to look for legal precedents in similar mediums?
The most similar medium of a mass participation system is usenet. There is the significant difference that there is no central foundation behind usenet, but in terms of individual responsibility and the problem of anonymity and slander, I think there are similarities.
Have there been any legal precedents with regards to postings, slander or anonymity with regards to usenet? If so, do these precedents have any bearing on the current Wikipedia situation? How costly or complex where these usenet-related legal cases?