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I am not convinced that automatic tagging of photos will enable better targeting of advertising. The things that can be tagged automatically are too specific (people's names, or maybe places). Beyond that manual tagging has to come into play (like eveybody attending Les Blog might be using the same tag on their flickr uploads). And even with manual tags, from an advertiser's perspective, photo search doesn't seem too compelling - except maybe to travel businesses. When I search for LesBlogs on Flickr, I get ads for cigarettes! :)

But then I am not on Riya alpha and perhaps they really have figured it out all well.

Great blog, Peter.

A historical note: In 1996-1997, the targeting/value relationship was dampened because ad inventory was growing faster than many sites' ability to sell it, and there was no Overture/Adwords-style marketplace to clear the low-end inventory. This led to a situation where, instead of delivering more clicks via targeting, it was easier to simply oversupply impressions, which got the extra clicks via brute force.

(By "oversupply impressions" I mean "deliver more impressions than the customer paid for" to make the CPM paid seem justifiable via the clicks generated.)

Absolutely right, Steve. The real problem was CPM instead of CPC. The early "media model" of CPM was a flawed paradigm that underexploited the web's ability to deliver an action instead of mere "impressions."

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