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We introduce the significance of a direct sentiment proxy as an explanatory variable of bidder announcement returns. We argue that sentiment subconsciously influences investor perception of potential merger synergies and risks, and therefore relates to bidder abnormal returns. We proxy daily sentiment based on Facebook status updates across seventeen international markets and show that there is a positive relation between sentiment and bidder announcement returns. In line with behavioral literature stating that sentiment more heavily influences uninformed traders, this relation is more pronounced in acquisitions with a low percentage of blockholder ownership, acquisitions of US public targets, and acquisitions of large targets relative to the size of the bidders. Our study goes beyond the conventional sentiment and stock market returns literature, uncovering a significant relation between sentiment and firm-specific abnormal returns to acquiring companies.

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This paper introduces the concept of divergence of sentiment to the behavioral finance literature. We measure the distance between people with positive and negative sentiment on a daily basis for 20 countries by using data from status updates on Facebook. The prediction is that a higher divergence of sentiment leads to more diverging views on prospects and risks, and thus to more diverging views on the value of a stock. In line with this prediction, divergence of sentiment is positively related to trading volume. We further predict and find a positive relation between divergence of sentiment and stock price volatility. The observed relations are stronger when individual investors are more likely to trade. We compare the effect of our country-specific measures to a global measure of divergence of sentiment. We find that the separate effects of country-specific and global divergence measures depend on a country's level of market integration.