The mass media in Turkey includes a wide variety of domestic and foreign periodicals expressing disparate views, and domestic newspapers are extremely competitive. However, media ownership is concentrated in the hands of a few large private media groups which are typically part of wider conglomerates controlled by wealthy individuals, which limits the views that are presented. In addition, the companies are willing to use their influence to support their owners' wider business interests, including by trying to maintain friendly relations with the government. The media exert a strong influence on public opinion. Censorship in Turkey is also an issue, and in the 2000s Turkey has seen many journalists arrested and writers prosecuted. On Reporters Without Borders' Press Freedom Index it has fallen from being ranked around 100 in 2005 to around 150 in 2013. In reaction to the failed coup d'état on 15 July 2016, over 150 media organisations, including newspapers, television and radio channels, news agencies, magazines and publishing houses, have been closed by the government of Turkey, and 160 journalists have been jailed. By circulation, the most popular daily newspapers are Sabah, Sözcü, Hürriyet, Posta, and Milliyet. The broadcast media have a very high penetration as satellite dishes and cable systems are widely available. The "Radio and Television Supreme Council" (RTÜK) is the government body overseeing the broadcast media. In 2003 a total of 257 television stations and 1,100 radio stations were licensed to operate, and others operated without licenses. Of those licensed, 16 television and 36 radio stations reached national audiences. In 2003 some 22.9 million televisions and 11.3 million radios were in service. Aside from Turkish, the state television network offers some programs in Arabic, Circassian, Kurdish, and Zaza. Turkish consumers are the second-most media illiterate when compared to countries in Europe, leaving them especially vulnerable to fake news, according to a 2018 study. A combination of low education levels, low reading scores, low media freedom and low societal trust went into making the score, which saw Turkey being placed second lowest only to North Macedonia. Conspiracy theories are a prevalent phenomenon in Turkish media. According to the Reuters Institute Digital News Report 2018, Turkey was the country where people complained the most about completely made-up stories. Legislative framework The Constitution of Turkey, at art. 28, states that the press is free and shall not be censored. Yet, Constitutional guarantees are undermined by restrictive provisions in