If you’ve spent any time on Twitter, you know that tweets can be snarky, informative, nonsensical, hilarious, and sometimes provocative. This is the “sentiment” of the Twittersphere. What Twitter does ...

Planet Money tries to make a program that reads Donald Trump's tweets and then trades stocks. The first step is training the program to interpret the tweets using something called sentiment analysis.

S&P Dow Jones Indices is launching the S&P 500 Twitter Sentiment Index, which aims to use the Twitter API to track S&P 500 components that are trending in sentiment ...