I cam across a data visualizer that looks a lot like the pageview analysis tool [1]. It shows the frequency of words in comments on reddit.com: the n-gram visualizer [2]. If only that dataset was public ;-)
[1] https://tools.wmflabs.org/pageviews/#start=2016-01-31&end=2016-02-19&...
[2] http://projects.fivethirtyeight.com/reddit-ngram/?keyword=global_warming.cli...