Exhibit 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Magid M. Abraham, certify that:

(1) I have reviewed this Annual Report on Form 10-K/A of comScore, Inc.; and

(2) Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report.

/s/ Magid M. Abraham

Magid M. Abraham, Ph. D.

President, Chief Executive Officer and Director

April 27, 2012