The line chart below shows positive tweets in blue and negative tweets in red on the morning on July 11, 2011. The word cloud below it was created using words that were tweeted that morning. It turns out that a bunch of trees had fallen on the tracks, causing delays on the Red, Brown and Purple lines. Naturally, people were not happy about that. Lots of negative tweets ensued.
Here's the take-home quote for the CTA and other transit agencies:
"The most interesting thing we found is that transit riders do not give any positive sentiment at a particular time. They only give negative sentiment," he said. Now, this may seem depressing if you work for one of these agencies. "But that’s not very disappointing," Hasan said, "because we found that the lack of negative sentiment is basically what transit authorities should look for. If there’s no negative sentiment at any given time, that means that things are running smoothly."
Also depicted in the gallery is an assortment of negative tweets about the CTA found in one 24-hour period.