Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

     We hereby consent to the incorporation by reference in this Registration Statement on Form S-8 of our report dated January 28, 2004, except as to Note 19 which is March 4, 2004, relating to the financial statements and financial statement schedule of DoubleClick Inc., which appears in DoubleClick Inc.’s Annual Report on Form 10-K for the year ended December 31, 2003.

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP
New York, New York
February 9, 2005