Facebook's IPO May Come Today

And it will be a whopper.

The online social network Facebook was to file for a $5 billion public stock offering with U.S. securities regulators Wednesday, several news outlets reported. The filing -- half the $10 billion most analysts earlier estimated -- is a starting point Facebook has said could ultimately value the company at $75 billion to $100 billion. That valuation would be one of the largest initial public offerings in U.S. history, CNBC reported.

CNN reports that Facebook's market valuation will likely exceed that of Disney or General Motors.