How did Trulia came out of nowhere to steal the thunder from Zillow?

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The first version of Trulia was bad. Jackass bad. It's like those crappy Google Maps mashup site built by a kid overnight. When Zillow came out, I thought they had won the real estate web sector. That's it. Then suddenly, out of nowhere came a revamped Trulia with a better site than the first version and most importantly, MORE HOUSE SALE LISTINGS than Zillow. What's a real estate site without real estate sale listings?