An editing battle over its "recession" entry prompted Wikipedia to put a temporarily lock on revisions to prevent new users from repeatedly changing the definitions of recession.
Russia's communications regulator says it will fine Wikipedia up to $47,000 for not complying with requests to take down information. It has made similar warnings to Google about YouTube videos.
Some doctors lambaste Wikipedia for errors in its medical pages. But there are many physicians, science teachers and researchers working overtime to make the crowdsourced health content better.
A law professor and expert on national security law sheds some light on the lawsuit by Wikipedia's parent company against the National Security Agency.