For the first time, U.S. Internet advertising revenue has surpassed that of broadcast television due to sharp growth in mobile and digital video ads.

CNET reported,  A 17 percent increase over 2012’s results, last year’s number helped the online ad industry beat the $40.1 billion in sales seen by traditional TV advertising. That achievement marked a first for online ad sales. Mobile ads contributed to the growth in 2013 with $7.1 billion in revenues, a 110 percent jump from the $3.4 billion generated the previous year.

Search accounted for:
41% of Q4 2013 revenues,down from 44% in Q4 2012, as mobile devices have shifted Search-related revenues away from the desktop computer.
Search revenues totaled $ 5.0 billion in Q4 2013, up 10 % from Q4 2012, when Search totaled $4.6 billion.