1. Zillow shares plunged over 9% due to Google testing real estate listings. 2. Google's listings could directly compete with Zillow's Premier Agent program. 3. Analysts see limited near-term impacts, but long-term risks persist. 4. Zillow's traffic stems largely from direct sources, potentially mitigating Google’s impact. 5. Stock remains down over 8% year-to-date amid market uncertainty.