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I agree though that the updates/refreshs of the index has been somewhat unstable and lacking from time to time. In fact we have a thread [webmasterworld.com] running to keep a little track of them.
It's clear that the db is devided in several segments of freshness.
Freshest is of course the segment with the sites crawled for the news search - those are crawled permanently.
Next is the db segment with the PFI pages - refreshed each 24-48 hours.
After those comes a chunk which supposedly gets updated each 7-10 days. This is what Fast refers to as popular content.
What's in this segment? How do you get in there? CTR? If so from ATW - or Lycos? Fresh content on the sites? Linkpop?
Finally - and that's where the lights get dimmer and the moaning gets louder - comes a base of urls which sometimes it takes months to get updated.
That's where we're at. Any comments and further insights welcome.