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Watching TV is America's most popular entertainment. Eighty percent of homes have three or more television sets. About 70 percent of US teens have TV sets in their rooms. Young Americans spend over 3 hours a day watching TV. On average, Americans watch television about 5 hours a day. The biggest TV broadcasting networks include ABC, NBC, and CBS. There are about 3,000 television stations in the USA. On average, US homes receive hundreds of TV channels, but viewers only watch 17 of those channels. The average American watches more than one hour of TV ads every day. There are about 10,000 commercial radio stations in the USA. There are a few stations free from commercials. They are National Public Radio (NPR), the Voice of America and Radio Free Europe/Radio Liberty. They transmit their programmes to listeners around the world. There are more than 1,500 daily newspapers and more than 7,200 magazines in the USA. The US is the home of the Internet. More than 85 percent of US teens go online every day.