What are the steps to creating a content discovery engine?

I'm creating an iPhone application similar StumbleUpon which relies on a content discovery engine, how do I go about doing that, and also, as a beginner to app development, what is the best way to index all the websites and videos I want people to "discover"?

Before you could create such application according to your requirement, there are certain steps which needed to be followed. As you mentioned you are a beginner to app development, it would be quite difficult for you to develop the entire iPhone application yourself. Seeking for professional help will be a better idea according to my opinion.

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