We classify the sentiment of a large sample of StockTwits messages as bullish,bearish or neutral, and create a stock-aggregate daily sentiment polarity measure.Polarity is positively associated with contemporaneous stock returns. On average,polarity is not able to predict next-day stock returns....

The paper develops and estimates a stock pricing model with sentiment shocks to stock price forecasts and learning about stock prices by investors which replicates several survey evidence on stock price forecasts along with a standard set of asset pricing facts for the United States. A unique...