When Zillow launched Zestimates, no one realized at the time how radical the impact of what they did then would become later. There are a lot of Sunday quarterbacks who would like to re-write history and say they knew it would result in helping to catapult the firm to $7 billion valuation. But no one predicted back then that Zestimates would fuel a phenomenon dubbed “real estate porn” that helped it drive more than 100 million unique visitors to Zillow’s website each month. Recently, another company that starts with a "z" called zavvie has launched what I believe is an [...]