Investor Perceptions of the Relationship of S&P 500 Stocks
This Demonstration shows a graph of investors’ perceptions of how stocks are related, based on information from an online stock forum on Twitter . Each vertex represents a stock. A line joining two vertices means that the two corresponding stocks were mentioned together in the stock forum.
The thickness of a line represents how much higher its occurrence is than pure chance. The size of a vertex represents the frequency of mentions for the stock. The different shapes used for the vertices indicate the industry for the stocks:
The only information used is that which includes both the most frequently mentioned 64 stocks and the most frequently mentioned eight industries.
 T. O. Sprenger and I. M. Welpe, "Tweets and Peers: Defining Industry Groups and Strategic Peers Based on Investor Perceptions of Stocks on Twitter," Algorithmic Finance, 1(1), 2011 pp. 57–76. http://dx.doi.org/10.3233/AF-2011-006.