Search advertising continues to dominate growth in online ads, even gaining a little market share over other types of advertising in 2011, according to a biannual report released today by the Interactive Advertising Bureau. But the biggest growth story is mobile ads, which saw triple-digit gains last year. According to the IAB report … overall online ad revenues rose 22 percent over 2010, to $31.7 billion. That catapulted online advertising past cable TV advertising for the first time. Highlights of the report: Mobile experienced the fastest growth of all categories—triple-digit growth year-over-year—up 149 percent to $1.6 billion …...