There’s always something to howl about.

Trulia.com versus Zillow.com revisited: Are your end-users temporary or permanent?

This is me last month, at the time of the Zillow.com’s most-recent software release:

In the world of Trulia.com — and other listings.bots focused on evanescent listings — users come and go. On the idealized Planet Zillow, users come and stay.

Home buying is at most an 18-month effort undertaken every seven to ten years, on average. Home ownership is continuous. Zillow attracts a lot of sellers, and it seems certain that it hopes to attract a countervailing cadre of buyers. But what Zillow is really doing, I think, is aiming at the 100 million-plus Americans who own their own homes. Some may come every day — to see new listings, to see new home photos, to ask or answer questions. Some may come only once in a while, when they have a particular need.

But its databases are permanent and accretive, constantly improving. I think Zillow’s goal is not to compete with Trulia or Google Base for home shoppers in the short run. I think its goal is to suck every bit of oxygen out of the residential real estate space as a vertical market. I’m not implying malice. But where others see this opportunity or that opportunity, I think Zillow.com sees the information marketplace for homeowners as a single unified whole, and I think the company’s goal is to dominate the whole thing in its entirety.

Today’s changes have the potential to make Trulia.com a stickier experience. But will it retain end-users after their homes have closed?

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