The recent shuttering of Zillow's home-flipping arm casts doubt on the accuracy of Zestimates. Zestimates are home valuations determined by a secret combination of public and user-submitted data. The ...

For many Americans, checking their home’s value on Zillow has become a digital-age ritual — part curiosity, part bragging rights. The Zestimate — available for homes both on and off the market — can ...