But other child advocates opposed the idea, saying that Facebook should instead focus on explaining to parents and children that the site isn't appropriate for use by children under 13.

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Mr. Jobs used to focus on pre-announcements of radically new products, explaining to the audience how they will change consumer lives.

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To paraphrase Don Knuth, we need to focus less on instructing a computer what to do step-by-step and more on explaining to other humans what we want computers to do.

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