The service is part of ABI Research's Mobile Devices, Content, and Applications research practice.

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Zuckerberg defended the practice of not showing a full and complete chronological feed of all content, saying people benefit from more important content, such as major life events, being given a more prominent place in their feeds.

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The more you practice a presentation out loud the more you internalize the words and the content.

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In practice, it is easier for law enforcement to obtain most private communications and other electronic content under the SCA than to obtain a warrant for more traditional correspondence or papers.

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Their technique, based on an algorithm they call P4P, could eventually offer a less controversial version of peer-to-peer file sharing, a practice that has flooded the Internet with pirated music and movies and ignited debate over what online content broadband providers should regulate.

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In practice, says Mr Tubiana, it is hard to keep only the numbers and not also the content of the messages.

ECONOMIST: Civil liberties