title: Using scoring to find customers
body: <p>I have a site where customers purchase items that are tagged with a variety of taxonomy terms. I want to create a group of customers who might be interested in the same items by considering the tags associated with purchases they've made. Rather than comparing a list of tags for each customer each time I want to build the group, I'm wondering if I can use some type of scoring to solve the problem.</p>
  
  <p>The way I'm thinking about it, each tag would have some unique number assigned to it. When I perform a scoring operation it would render a number that could only be achieved by combining a specific set of tags.</p>
  
  <p>I could update a customer's "score" periodically so that it remains relevant.</p>
  
  <p>Am I on the right track? Any ideas?</p>