【洛杉矶时报110929】用推特留下人们的情绪
一个对推特两年的分析结论认为，处于各种事物之中的人，醒来是心情愉快，但随着一天的安排展开，人们就会变得爱抱怨。Using Twitter to track people's moods
An analysis of two years of tweets concludes, among other things, that people wake up happy but get grumpier as the day progresses.
http://www.latimes.com/health/la-he-twitter-mood-20110930,0,5945251.story
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