In Pictures: 15 iPhone apps that changed our world

The first iPhone hit the market less than five years ago -- and shook up our world. Now iPhone sightings are everywhere, with Apple lovers listening to music, playing games and staring into tiny screens. The last holdouts are coming around and finally getting a smartphone. Most people feel lost without their iPhones. Can you live without these iPhone apps?

Facebook, Twitter

Whether or not Facebook and Twitter have changed our lives is a good question. If they have, then there's no question that the Facebook and Twitter apps on the iPhone have changed how we interact with the popular social networks. Checking status updates and Tweets isn't confined to a certain hour in the day. We're social creatures and check them constantly. That's why social networks report that people are accessing them mostly through mobile apps.

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