This section continues in the Subscriber's Area. Facebook Shares Jump as Rising Sales Silence Mobile-Ad Skeptics � This article by Douglas MacMillan and Brian Womack for Bloomberg may be of interest to subscribers. Here is a section: Mobile ads, which made up 30 percent of revenue in the first quarter, will soon account for more than half of advertising dollars, Zuckerberg said on a conference call. The number of mobile users expanded 51 percent to 819 million during the quarter.