Zillow is facing lawsuits. Here's how it disrupted real estate

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With approximately 250 million unique monthly visitors, Zillow is the most widely used real estate portal in the United States. It's among just a handful of online real estate platforms that transformed the way Americans buy, sell and rent homes.

The company offers a free mobile and web app that provides significant detail on approximately 165 million homes. In the past, these listing data were available only to real estate agents in the industry's Multiple Listing Services system.

Zillow also offers innovative products like the "Zestimate," a machine learning algorithm that approximates a home's value. The feature has a median error rate of 2% for active listings and 7.1% for off-market homes, according to