Each graph shows the number of times a company (in this case, Google and Facebook) have been mentioned in Tweets by members of the Delphia community. Specifically, the data comes from members who have connected their Twitter accounts. We further segment the number of Tweets based on their sentiment.
Taking the example of Facebook, a positive Tweet could be something like "I love Facebook so much!"
A neutral Tweet could be "I was on Facebook today."
A negative Tweet may be something along the lines of "I hate Facebook so much!"