There’s always something to howl about.

Feed the starving Realty.bot: Zillow.com is underwhelming, so far, as a National Property Listings Service . . .

I think I have to back off — for now, at least — from my earlier expectations for Zillow.com as an incipient National Property Listings Service. To this date, anyway, Zillow’s appeal to sellers and listing agents has been underwhelming, at best. As I write, there are 19,250 homes listed for sale on the system. An additional 10,381 are listed under the “Make Me Move” option. By contrast, at the time that Zillow.com released these changes to its software, Trulia.com announced that it had achieved one million on-line listings.

At that time, I had written Trulia and other on-line listings aggregators off as dinosaurs, and I still believe this is true. But if Zillow.com represents the coming of the mammals, the first mammalian species to have evolved must have been the sloth.

What’s the problem?

No XML feed.

When these software upgrades were made, Galen Ward speculated that Zillow had skipped the feed to capture agents’ eyeballs for its advertising. If this is the actual reason Zillow elected not to permit listing by XML feed — as is done by the other Realty.bot listings aggregators — then the strategy has backfired.

Whatever Zillow’s reason not to have a feed, that reason is wrong. In making these changes, Zillow.com voluntarily surrendered the fearsome mojo of it’s Delphic Automated Valuation Method. Overnight, it transformed itself from every Realtor’s favorite bette noir to… just another listings bot. And as exciting as it might be as a listings bot, it’s but one more of what are already too many listings bots — and the only one of the bunch that can’t be fed from PostLets or vFlyer or one of many proprietary Realtor web site vendors.

That is: It went from being potentially threatening to Realtors but fundamentally useless to potentially useful but fundamentally a pain in the ass to Realtors.

This turns out not to have been an improvement, especially as Zillow.com prepares to roll out an advertising product targeted to Realtors. Zillow.com has always been able to deliver potential sellers — even as it delivers wildly inaccurate Zestimates to them. But without a significant number of homes listed for sale, Zillow.com will not attract potential buyers.

That’s a chicken-and-egg problem, but it’s one that is easily solved: Create an XML feed format that is readily regurgitated by the PostLets and vFlyers of the world. If Zillow wants to do something much more elegant for major brokers and MLS/IDX systems, that’s great. But it makes absolutely no sense for Zillow.com to have records on 67 million homes and listings for fewer than 20,000 of them…

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