Citing massive growth in their user base ("25 million users, 1000+ games, 12 billion player minutes per month, and 75 billion Steam client minutes per month"), Valve unveiled a revamped UI for Steam on Tuesday, opening the beta test to anyone who wants to try it out. There are many changes, and an increased focus on social features: "Right from within your own game Library, you can now track which of your friends plays each game or invite them to play one with you. Before you've even bought a game, knowing whether your friends play it is one of the most useful pieces of information to have. So on the store homepage, there's a new listing of what your friends have bought or played lately." Tracking games and achievements have both gotten simpler, and Valve has dropped the Internet Explorer rendering engine in favor of WebKit. An enterprising user also found files that may indicate the existence of an OS X Steam client.