An Efficient Frontier study of 30 clients shows tablet usage accounts for half of all mobile clicks.
Increased investment from advertisers in the vertical pushed click prices up.
San Francisco-based Context Optional is a Facebook preferred developer.
Advertisers in the finance category spent 40 percent more on search ad clicks in March.
Advertisers are investing more in Facebook ads, according to Efficient Frontier.
Advertisers continue to increase their spending on search advertising, driving up the price of CPC ads.
Search ad prices rose across the board in December, year-over-year, as the market continues to grow.
The cost of travel and automotive search ads rose considerably in November.
SEMs are buying more display media through data-driven platforms.
Microsoft's Bing engine continues to grow its share of spend and improve ROI, but at Yahoo's expense rather than Google's.

June 6, 2012
1:00pm ET / 10:00am PT