Using the Facetune app on a tablet computer
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Photo-editing app Facetune: Why so popular?

While app stores are increasing their profits this year by billions of dollars, new apps are harder to sell as users have become more discerning.

Mark Lobel visited the creators of the photo-editing app Facetune, who are based in Israel, to find out how they created a product which has sold extensively in over 100 countries.

Watch: Middle East Business Report