ListTrac’s plan to sell agent and consumer behavior data

There’s a well-known saying on the Internet: "If you’re not paying for the product, you are the product." Sites such as Google, Facebook and Amazon routinely track users both for their own use and for third-party advertising. Zillow and realtor.com do as well. Now, the websites of potentially hundreds of thousands of agents are either already doing or about to do the same thing — but largely without agents’ knowledge or consent or that of their broker …