Google versus Facebook: the batter for revenue supremacy

Google Inc. is taking the threat posed by Facebook Inc.'s Internet social network more seriously since co-founder Larry Page returned as CEO a year ago. Although Facebook is far smaller than Google, Page is worried the social network is gaining valuable insight into its users' lives that could lure away online advertisers.

Here's how the two companies compare, 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, 845 million; Google, more than 100 million.

EMPLOYEES: Google, 32,500; Facebook, 3,200.

CEO: Google, co-founder Larry Page; Facebook, co-founder Mark Zuckerberg.