Citizen journalism involves members of the public collecting and reporting news and information without professional journalism training. It utilizes modern technology and the internet to create, augment, or fact-check media. There are various types of citizen journalism including audience participation, independent news sites, and collaborative news sites. While it provides an opportunity for public participation, critics argue that citizen journalists may lack objectivity and professional standards of traditional journalists. Advocates counter that citizen journalism has expanded news coverage in important events like 9/11 and the 2004 Indian Ocean tsunami.