Zillow, you're growing up so fast! You spent your year as a 5 year-old as an overachieving, real estate prodigy, blowing up the news feeds, and we love you for it. Thanks for Zillow Mobile App, the $350,000 Home Giveaway, and even at your young age, adopting Postlets into the Zillow family. We don't have any lavish presents to give you -- after all, what do you give the real estate site that has everything?! -- but here's a heartfelt Happy 6th Birthday from the Curbed Seattle family.