Ten times more marketers are using Facebook Custom Audiences than a year ago

"Facebook said it had seen strong advertising revenue growth in the mobile gaming, e-commerce and consumer-packaged goods sectors, as well as from small and medium businesses, and in direct response advertising.
The site plans to invest in its ad products as a "high priority" and developing its targeting tools is one of three key areas.
Facebook claims that ten times more marketers are now using its ‘Custom Audiences’ targeting feature compared to the same period last year. It gives Ben & Jerry’s as an example, after the ice cream brand targeted premium buyers with Facebook tools and attributed an 8.1 per cent sales uplift to the campaign."

Source:  Marketing Magazine, 24th April 2014