Facebook is head and shoulders ahead of any other mobile app in the US, garnering around 125 million unique visitors each month there from phones. This is revealed by a report on apps from US Media Metrix owner comScore, from internal data, confirmed by over 1,000 user surveys. The new comScore US Mobile App Report shows that app usage is growing dramatically faster than people who use the web on a smart phone. It also shows that much of this usage is based on social media, entertainment, video, music and games. comScore shows a 90% growth in App usage over a two years period since the middle of 2013, and a parallel increase of 53% growth in mobile browser usage,…