Universal social fitness app

[jmerrey]

I'm curious if anyone knows of an app the has social and fitness aspects, and syncs with a variety of devices. Here's what brought this up. My dad was very curious about my MS Band, but once he found out it didn't sync with Fitbit, he was out. He is a member of a family group with about 20 members who all compare steps, diet, etc, almost in friendly competition. It got me to thinking how cool it would be if there was a single app for iOS/WP/android that could import steps, workouts, and diet from many devices/apps for comparison and competition. Is there an app like this that I'm completely overlooking?