Summary: The online encyclopedia Wikipedia is often referred to as an "open-source" project because it is written, edited and policed by a global group of volunteers.

Summary: Just last week, Wikipedia announced that it would no longer allow unregistered users to post new content, on the theory that contributors--who have provided some personal information to register--will be more accountable for what they write.

Summary: Since last Monday's Op-Ed in USA Today in which John Seigenthaler Sr. criticizes Wikipedia as a "flawed and irresponsible research tool" (see E&P's "The Dangers of Wikipedia"), the citizen media site's many supporters and detractors have begun a serious debate.

Summary: So we come to the question of responsibility. We've promised to deal with the ethics of Wikipedia before, and it's no longer possible to ignore the elephant in the room, so we must.