Realtor.com was recently singled out for sending data via tools called App Events, but other sites, including Zillow and Redfin, share their data with third parties as well
![Tracking systems zero in on what buyers really want [Special Report]](https://assets.inman.com/wp-content/uploads/2015/02/Sergey-Nivens_117237202-450x200.jpg)
Monitoring consumer search activity raises privacy concerns
consumer privacy bill of rights
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