Letizia Mencarini, Delia Irazú Hernández-Farías, Mirko Lai, Viviana Patti, Emilio Sulis, Daniele Vignoli, Happy parents’ tweets, Demographic Research, Vol. 40 (JANUARY - JUNE 2019), pp. 693-724 ...

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.