Zillow's solid third-quarter results impressed investors.Shares of Zillow Group (Z 1.67%) (ZG 1.70%), the online real estate platform, rose sharply this week after the company reported better-than-expected third-quarter results (which ended Sept. 30).Zillow's share price was up by 23%, as of this writing, adding to the company's phenomenal gains of 94% over the past 12 months.Solid quarter, despite a difficult housing market The housing market has been stymied recently thanks to high mortgage rates and risi ...