U.S. online advertising is expected to grow by 20 percent this year to US$31.3 billion, according to researcher eMarketer.
The firm revised a previous estimate of 10 percent growth for this year, mostly due to the strength of display advertising, which is expected to overtake search advertising within five years, GigaOM reported.
Search advertising will increase by 19.8 percent to $14.4 billion, while online display ads will gain 24.5 percent to $12.3 billion. The biggest factors causing growth in display advertising are video ads and banner ads, which are expected to reach $2.2 billion and $7.6 billion, respectively.
Online advertising is expected to contribute about one-fifth of all major media ad buying this year, up from 17 percent in 2010. By 2015, it will represent 28 percent of all U.S. media ad spending, eMarketer said.