iPhone 'Find My Friends' app saves man after he gets stuck on a mountain

There's an iPhone app that many Apple users have never fired up, but others refer to obsessively. It's called Find My Friends and it means you can see where your friends are. If that sounds too Big Brother, don't worry, your friends must opt in on their iPhone, iPad or iPod touch. And obviously you have to give your consent before anyone can see where you are. It's not meant for spying on people.