Here's the two rivals stack up, based on the latest available data:
Annual revenue: Google, $38 billion; Facebook, $3.7 billion.
Advertising revenue: Google, $36.5 billion; Facebook, $3.2 billion.
Annual net income: Google, $9.7 billion; Facebook, $668 million.
Social networking users: Facebook, more than 900 million; Google, more than 170 million.
Employees (as of March 31): Google, 33,100; Facebook, 3,500.
CEO: Google, co-founder Larry Page; Facebook, co-founder Mark Zuckerberg.
Amount raised in IPO: Google, $1.67 billion; Facebook, $16 billion. Figures include shares sold by stockholders and exclude bankers' option to sell more shares.
IPO stock price: Google, $85; Facebook $38.
Market valuation at debut: Google, $24.6 billion; Facebook, $104 billion.
Date of stock market debut: Google, Aug. 19, 2004; Facebook, May 18, 2012 (expected).
Percent gain of stock on first day of trading: Google, 18 percent; Facebook, to be determined.
Current market value: Google, $203 billion; Facebook, $104 billion.
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