While social networking site Facebook remains the top app in the US, its Messenger app has stolen the number two position from YouTube, a latest US market report has revealed.<br />The social networking service Facebook has ranked as the top smartphone app, reaching 73.3 percent of the app audience, followed by Facebook Messenger , YouTube and Google Search , said the latest findings from global digital media analytics firm comScore.<br />Nearly 192 million people in the US own smartphones during the three months ending in July this year, the findings showed.
