The dependent variable ,+1in Equation (2) is the abnormal return of stock i in month t + 1. The main variable of interest is ,, which is either the abnormal app downloads or abnormal daily users of stock i in month t. , is a vector of control variables, including market capitalization, book-to-market ratio, past stock performance, gross profitability, dollar trading volume, the coefficient of variation of dollar trading volume, and the advertising expenses. Year-month dummies are included to control for time effects. Standard errors are clustered by stocks to account for the residual correlation across different observations related to the same stock.