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Concentrations (Tables)
 9 Months Ended
Sep. 30, 2012
Concentrations [Abstract]  
Schedules of concentration of risk based on consolidated revenue
                                 
    Nine months ended
September 30,		     Three months ended
September 30,		  
    2011     2012     2011     2012  

Advertiser A

     30 %      27 %      31 %      26 % 
Schedules of concentration of risk based on accounts receivable
                 
    At December 31,
2011		     At September 30,
2012		  

Advertiser A

     37 %      32 % 

Advertiser B

     *       13 %