Few months back I read in a newspaper that some PhD paper had few sentences taken from Wikipedia and things like those. Wikipedia has made revolution but I had no idea it has made few companies go out of business.
Wikipedia is not alone and Mashable and Techcrunch blogs are threat to the Daily Newspaper Industries as well.
Wikipedia is a free access site with all its rights protected. Its not payable but equally qualitative, providing an easiest, cheaper, better way to student to get information. So, it has forced Brittannica to pay more attention on their e-volumes rather than written scriptures.