Apple continued to be the leader in mobile ad revenue by a significant margin in 2014, based on the latest insights from Opera Mediaworks (via TechCrunch). According to the report, iOS captured 51.67% of ad revenue and 27.18% of traffic during the fourth quarter to close out the year as the leader in dollars earned. Meanwhile, Android trailed in second in revenue with a 41.20% share despite generating an all-time high in ad impressions and commanding 62.69% of traffic among mobile operating systems. Android may have expanded and taken the lead in traffic, but iOS retained its solid lead for revenue generation and monetization. Apple’s tenacious grip on revenue generation is driven to a large extent by its favorable market position in western markets, such as the United States, Germany and the United Kingdom. In these markets, rich media and video advertising are more common and the high volume of mobile application usage (vs. mobile browsing) drives a robust user acquisition market.The mobile advertisin