Accuracy of GoogleTrends, 'Trending topics' listings?

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Hello,

The 'Trending Topics' listings e.g., Twitter as one of a growing number of examples, and GoogleTrends analyzes what keywords, and key phrases users have collectively typed in; hence 'Trending Topics' listings results.

Are lists of trending words (based only on what users have typed in) a good indicator of emerging trends? Or would trending keywords and key phrases gleaned from current (already published) Internet and news-media content be of interest to trend-spotters?

Would Trending topics data gleaned from published content allow a better context of emerging trends, as opposed to 'Trending Topics' lists from user keyword searches only?

The following story discusses information services that go beyond the typical 'Trending topics' listings.

#Trending - Nate Silver Meets Anna Wintour in New Trend-Spotting Technology.

http://www.providencejournal.com/busine ... nology.ece

Thank-you