Certainly there are definitions from other jurisdictions, the United States, for example, that cover part of the problem by specifying that the information provided is a part of someone's livelihood or a substantial portion of their income. That doesn't capture the second difficulty with the definition; that is in such publications as NAMBLA's, where you have someone who, for very different interests, assumes the role of a journalist, and I'm not frankly sure how you would capture that within the definition. That's a very difficult drafting exercise, and I have the easy role of identifying a problem without having to propose a solution to it.
On March 5th, 2008. See this statement in context.