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I would think that the only prerequisites to being a good journalist would be the ability to research a subject and the ability to communicate your findings in a clear and informative manner
As to the first part, no it's not. There are also the courses on photography, newspaper (or website) layout, communications law, and a score of others that I had to take more than 20 years ago. As to the second, the ability to research and communicate your findings is what separates a good writer from a bad writer.
Regardless, for an interesting look at a world where bloggers are considered at least as important as what are traditionally referred to as journalists, check out the
newsflesh trillogy.