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Using our real-time analysis of depression … Using our real-time analysis of depression surveillance on Twitter, there were 417 tweets - within 15 miles of Toronto - expressing sadness (or what Twitter calls a "negative attitude") during 17 minutes on March 12 (from 1:06pm EST to 1:23pm EST). During the very same time frame, there were 1,500 tweets from Toronto showing happiness or a "positive attitude." This suggests that the ratio of happy comments to sad comments in the Toronto area was 3.6 to 1. comments in the Toronto area was 3.6 to 1.
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