While Facebook's userbase has been consistently growing for years, its monetary value has been less than consistent. Facebook stunned the world in October 2007 when a Microsoft investment valued the company at $15 Billion. The recession hit Facebook's value hard though, dropping it all the way to $3.7 Billion in February of this year.
Facebook's value has been fighting back ever since. In July, its value reached $6.5 Billion after a fresh $200 million investment. And now, according to Bloomberg, Facebook's valuation has reach $9.5 Billion, a 42% increase in just four months.
The $9.5 billion number is derived from the value of Facebook's stock. While Facebook is a private company, stock of the social networking company is still getting exchanged. The value today is around $21 per share, a big jump from the price Digital Ventures paid in July: $14.77 per share.