How to get the facebook app back on my iphone 4?

I updated something on my phone (ios 7). Before I did this, I could just click on the facebook app on the home screen but now it's gone and I don't know how to get on facebook from my phone now. The same has happened with a couple of games e.g. Temple run. How can I get the app back on the homepage?

Go in the browser and type fb.com

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