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     As of December 31,
    

2005

   

2006

Assets

    

Current assets:

    

Cash and cash equivalents

   $ 3,877,174     $ 3,544,671

Marketable securities

     4,157,073       7,699,243

Accounts receivable, net of allowance of $14,852 and $16,914

     687,976       1,322,340

Deferred income taxes, net

     49,341       29,713

Prepaid revenue share, expenses and other assets

     229,507       443,880
              

Total current assets

     9,001,071       13,039,847

Prepaid revenue share, expenses and other assets, non-current

     16,941       114,455

Non-marketable equity securities

     14,369       1,031,850

Property and equipment, net

     961,749       2,395,239

Intangible assets, net

     82,783       346,841

Goodwill

     194,900       1,545,119
              

Total assets

   $ 10,271,813     $ 18,473,351
              

Liabilities and Stockholders’ Equity

    

Current liabilities:

    

Accounts payable

   $ 115,575     $ 211,169

Accrued compensation and benefits

     198,788       351,671

Accrued expenses and other current liabilities

     114,377       265,872

Accrued revenue share

     215,771       370,364

Deferred revenue

     73,099       105,136

Income taxes payable

     27,774       375
              

Total current liabilities

     745,384       1,304,587

Deferred revenue, long-term

     10,468       20,006

Deferred income taxes, net

     35,419       40,421

Other long-term liabilities

     61,585       68,497

Commitments and contingencies

    

Stockholders’ equity:

    

Class A and Class B common stock, $0.001 par value per share: 9,000,000 shares authorized; 293,027 (Class A 201,268, Class B 91,759) and par value of $293 (Class A $201, Class B $92) and 308,997 (Class A 227,670, Class B 81,327) and par value of $309 (Class A $228, Class B $81) shares issued and outstanding, excluding 3,303 (Class A 2,069, Class B 1,234) and 1,296 (Class A 1,045, Class B 251) shares subject to repurchase (see Note 11) at December 31, 2005 and 2006

     293       309

Additional paid-in capital

     7,477,792       11,882,906

Deferred stock-based compensation

     (119,015 )     —  

Accumulated other comprehensive income

     4,019       23,311

Retained earnings

     2,055,868       5,133,314
              

Total stockholders’ equity

     9,418,957       17,039,840
              

Total liabilities and stockholders’ equity

   $ 10,271,813     $ 18,473,351