“A lot of mood-tracking tools are built on the idea that people would track their mood at least once a day because they’re supposed to identify patterns and triggers,” says Stephen Schueller, associate professor of psychological science at the University of California, Irvine, who has studied mood-tracking apps. Schueller and his colleagues found …. While people are drawn to such apps by negative life events—a divorce, a death—they are more inclined to document positive moods. 

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