I wonder about the data legitimacy on these sites. I looked my place up on Zillow a few weeks ago, and it said $1.5 million. There's been only 1 sale here in t

I wonder about the data legitimacy on these sites. I looked my place up on Zillow a few weeks ago, and it said $1.5 million. There's been only 1 sale here in the past 2 years, artificially low at $950K. A neighbor's just sold for $1.32M. Meanwhile, Redfin has mine at $1.04M. Zillow has my original purchase price at about 45% of what it actually was (and publicly recorded at). WTF?