Twitter Inc (TWTR.N) said on Wednesday it has agreed to sell mobile ad company MoPub to AppLovin Corp (APP.O) for $1.05 billion in cash, as the microblogging platform looks to focus more on advertisements on its own app and website. MoPub, which generated about $188 million in annual revenue for Twitter last year, allows companies to keep track of ad inventory in real time, similar to Google"s (GOOGL.O) DoubleClick. "The sale of MoPub positions us to concentrate more of our efforts on the massive potential for ads on our website and in our apps," Twitter Chief Financial Officer Ned Segal said. Twitter said on Wednesday it will focus on its core business by accelerating development of new products and features to achieve its goal of doubling its revenue in 2023 to $7.5 billion. The MoPub deal comes months after Apple updated its mobile operating system that powers iPhones and iPads to make it hard for digital advertisers, including social media platforms and mobile game developers, to track users on Apple mobile devices.