Definition: Twitter bullishness
The ECB states in its report: “We define a tweet as bullish if it contains the term ‘bullish’ and bearish if it contains the term ‘bearish’. Over the study period from 2010 to 2012, we find about 0.31 million bullish and bearish tweets. There are 1,091 days in total, and the average daily number of bullish and bearish tweets is 280.”