Facebook has taken over the world as the social networking giant since its launch in 2004. CEO and founder Mark Zuckerberg is now a billionaire on paper and recent funding of $500 million from Goldman Sachs Group Inc. (NYSE: GS) put the valuation at a staggering $50 billion. Suddenly, the Microsoft Corporation (NASDAQ: MSFT) investment of $240 million for a 1.6% stake and about $15 billion valuation seems like a steal. Zuckerberg has said an IPO will be inevitable, but the time frame is ‘later,’ and he has tried to keep the act up that Facebook will not file for an IPO this year. The SEC is inquiring about its sales of shares for insiders and over its finances due to the number of holders; the SEC requires companies with 500 or more shareholders to make financial filings almost the same as if they were a public company. In the end, whether Zuckerberg wants to have it public or not, you could argue that Facebook is already partly public.