iPhone Tip: Did you know that, in some cases, you don't have to click on your home button and re-click that app to get back in?
If you are deep in the app game and have an article opened from your Facebook, an external site you opened from Twitter, or photos opened from your camera, this features offers a way to get back to the original app with a line in the upper left hand column. In this case, it says "Back to Camera."