The Nike+ app for iOS devices has reached its fifth birthday, prompting the company to offer the app free for a limited time. The Nike+ GPS app not only maps a user's runs, it offers socialization of results through Facebook and Twitter, encouraging messages from Nike's top athletes, a log of all the user's runs, a soundtrack of "powersongs" to keep the runner motivated, and even offers a high-tech method of playing "Tag" by outrunning your friends to avoid being tagged "It."
