The SEC is reportedly investigating trading on secondary markets like SecondMarket and SharesPost in the stock of social media companies Facebook, Twitter, LinkedIn and Zynga. The SEC is said to be focusing on whether the secondary market trading has brought the number of shareholders in a company like Facebook above 500. Reaching that threshold triggers requirements for more public financial disclosures, a requirement that in the past has driven companies like Google and Microsoft to pursue IPOs. – Forbes

Dominant Social Theme: Social networking is the next stock market wave.