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Concentrations (Tables) | 9 Months Ended
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Sep. 30, 2013
Schedules of Concentration of Risk Based on Consolidated Revenue | The advertisers representing more than 10% of consolidated revenue are as follows:
|  | Nine months ended September 30, |  |  | Three months ended September 30, |
|  | 2012 |  |  | 2013 |  |  | 2012 |  |  | 2013 |
Advertiser A |  |  | 29 | % |  |  | 25 | % |  |  | 27 | % |  |  | 25 | %
Advertiser B |  |  | * |  |  |  | 14 | % |  |  | * |  |  |  | 13 | %
Advertiser C |  |  | * |  |  |  | 11 | % |  |  | * |  |  |  | 12 | %
Schedules of Concentration of Risk Based on Accounts Receivable | The outstanding receivable balance for each advertiser representing more than 10% of accounts receivable is as follows:
|  | At December 31, 2012 |  |  | At September 30, 2013 |
Advertiser A |  |  | 36 | % |  |  | 32 | %
Advertiser B |  |  | 11 | % |  |  | 17 | %
Advertiser C |  |  | * |  |  |  | 11 | %

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