Data released on Thursday from the Internet Advertising Bureau and PricewaterhouseCoopers showed the growth slowed to 14 percent from 23 percent in the year-ago period.
David Silverman, a partner at PwC, said 2011 benefited from a comeback after advertisers put the brakes on spending during the recession.
Mobile advertising was a strong gainer, jumping 95 percent to $1.2 billion. Video advertising rose 18 percent to $1 billion.
Search advertising took the biggest share of the spending at $8.1 billion, while display advertising totaled $5.6 billion.
(Reporting by Jennifer Saba; Editing by Richard Chang)
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