Before you (required) sign up with Facebook, you can go to a sample game to see how it goes. That shows what the app after logging is capable of. You catch a game and tells you whether 1, 3 or 5 km to walk, or 1 or 5 miles. Then you can select whether you against any person or friend to run and give you or your music from your iPhone while running to and if so, what. At Home Run is your opponent sought and if you click on the Run button, starting the counters at both running.
In a gray bar at the top picture you can see how long you've been running and how many miles you or behind you, or even lead. Unfortunately there is no possibility to display statistics in kilometers, even though you have to indicate that you want to run kilometer distances. Under the gray bar is your distance and your average time you need for one mile. And under your own statistics, is the same idea of your opponent up. So you can instantly compare. If you're not taking accidentally touching the screen (or cancel the pause button for example), you can choose the right job lockscreen. This is a slide-to-unlock button on screen that the data recorded still visible, but you can not quickly in print. Without lock screen can be left with a knob to adjust the music.
During running Run With Friends gives you audio updates on how your opponent is doing. Thus you immediately, if desired, adjust the speed on those. That is a pretty competitive element. But the app takes it a step further. The moment a Facebook friend knocks on your time away, you push a message that encourages you time to improve. At the moment you challenge, of course you run directly against the challenger. The races are not live online, but are loaded. That makes a difference in data usage.
Run With Friends is not the only app where you can run with others. In Runkeeper you can also specify that you and others running in Nike + GPS can be a challenge with a friend to go. Then it's all about who makes the most mileage in a given time, exactly the opposite reasoning is. The nice thing about Run With Friends is that the app only focuses on running with friends, which keeps track and also completely free.
Download: Run With Friends