Many news organizations based in other media also distribute news online, but the amount they use of the new medium varies. Some news organizations use the Web exclusively or as a secondary outlet for their content. The Online News Association, founded in 1999, is the largest organization representing online journalists, with more than 1,700 members whose principal livelihood involves gathering or producing news for digital presentation.The Internet challenges traditional news organizations in several ways. Newspapers may lose classified advertising to websites, which are often targeted by interest instead of geography. These organizations are concerned about real and perceived loss of viewers and circulation to the Internet.