EVEN advertisers can be seduced by slick marketing. Google and Facebook have built huge businesses by promising that online ads are more effective and easily measured than traditional media, such as television, radio and print. This year the amount spent on internet advertising, globally and in America, is forecast to surpass television advertising for the first time (see chart). But a controversy at YouTube, an online-video site owned by Google, shows how digital advertising still has problems to sort out before it lives up to the dazzling sales pitch.
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