We've added sentiment analysis to board pages. The analysis is done by a module called Vader (probably named after the noted country singer, Garth Vader, but I could be wrong). You can read more about it here:
Hutto, C.J. & Gilbert, E.E. (2014). VADER: A Parsimonious Rule-based Model for Sentiment Analysis of Social Media Text. Eighth International Conference on Weblogs and Social Media (ICWSM-14). Ann Arbor, MI, June 2014. http://comp.social.gatech.edu/papers/icwsm14.vader.hutto.pdf
On the graph, values range from 1 (the most positive possible) to -1 (the most negative possible). We started collecting data on every non private post about a week ago. The graphs provide a rolling 7 days worth of sentiment averages.
What does it mean? You tell me. It's interesting though
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