The Company believes that the non-GAAP financial measures revenues excluding traffic acquisition costs ("TAC"), operating income before depreciation and amortization and free cash flow are helpful, when presented in conjunction with the comparable GAAP measures of gross profit, income from operations, and cash flow from operating activities. Revenues excluding TAC is defined as gross profit before other cost of revenues. We believe this performance measure is useful to management and investors as it is more comparable to our historical profitability, because traffic acquisition costs paid to affiliates of Overture Services,.
