Propelled by development of digital media, proliferation of information has obtained a significant impact on financial markets. Therefore, in order to be flourishing, firms need to pay attention to its representation in multiple digital media. For instance, in September 2004, Kryptonite announced a lock exchange plan soon after a negative video that showed how to pick a Kryptonite bike lock with a Bic pen went viral on the blogosphere. In such a developing environment, an important question arises: could digital media metrics (web blogs, consumer ratings and many others) become a leading indicator of financial securities, mainly shares? The answer on this question will affect behavior of senior executives, who maximize firms’ value, and investors’ decisions.

In their study, “Social Media and Firm Equity Value”, Xueming Luo et al. test the predictive power of two sources of social media: blogs and ratings. According to their initial hypothesis, information wandering around on social media sites affects firm’s value, which enables investors to forecast changes in the price of its shares. The authors state that because social media content diffusion is accelerated, the stock market responds faster to information transmitted through social media. More than that, platforms consisting of user-generated content excite the authors’ attention as they accurately record consumers’ feedback and recommendations which are self-revealed by them. Given social media account for a significant amount of users’ online time (as at 2010, a quarter), social media metrics could become good proxies of costumer sentiment. As authors state, the latter plays an important role in the evaluation of a firm’s market price.

To test their hypotheses, Luo, Zhang and Duan conducted a regression analysis based on data on some firms’ social media metrics (rating level, rating volume, the number of positive blogs and many others). This data represented nine firms over approximately 500 trading days. After running a regression model, a statistically significant relationship between rating level and firm return was found: a one-point increase in the former leaded to the three-percent increase in the latter. In a nutshell, the test’s results confirmed their hypotheses of the causal relationship between social media metrics and firm’s value.
I generally agree that social media facilitate information spread which makes news about the firm go viral and amplify investors’ gloom or joy. However, I don’t believe that consumer sentiment, which is the key variable in the discussed study, has something to do with the fundamental value of a firm. The latter is determined by a firm’s performance or, to be more precise, by its expected future profits. Therefore news which represents changes in a firm’s performance may have a long-term effect on its value while buzzing rumor only leads to short term deviations from its fair price.

To sum up, digital media, and in particular social media, affect the value of financial securities, like shares, by facilitating the diffusion of some information related to them. But it’s important to distinguish between changes in prices caused by hype and warranted changes based on relevant financial information. One way to do this may be allowing for the trade volumes in an analysis.
References
Luo, Xuemin, et al., “Social Media and Firm Equity Value”, Information Systems Research Vol. 24, No. 1, March 2013, pp. 146–163





















