Its third choice topic may very well be Disney.

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According to the latest Census figures on the topic, one-third of all housing units are occupied by renters.

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In fact, he spends about one-third of Bad Pharma discussing this topic.

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Along the way, Winchester pauses every third paragraph or so to delve into some topic that is not, at first glance, relevant to his story: Lloyd's of London, for instance, or the Reuters news agency, or Dutch colonial policy in Java, or the biological theories of Alfred Russel Wallace.

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Ghana, Mexico, Nigeria and Turkey were among the other countries where this topic appeared a particular concern, with a third or more of those sampled saying they had discussed the issue in the month before the survey.

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McFaul told reporters about a third of the session was devoted to Syria, making it the biggest single topic.

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And the third is that "people-centric" recommendations are being augmented by "topic-centric" networks -- which is to say that while Facebook lets you explore the Web through information shared by friends, newer social networks organize content by topics of interest.

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