Good journalism is like mining for gold. You don’t find gold just anywhere. You need to know where to look. The same in journalism. What you are looking for is “the story.”
Web mining is a similar discipline. You don’t just arbitrarily drift through cyberspace and hope to uncover deposits of gold, or data with golden value. You need more than a hunch and a prayer to find serious gold veins, and the same holds true when it comes to mining the web for information.