Not sure that you wanted to know this or if this was mentioned already as I'm just now going through my 13,000+ emails from this list, but this isn't done dynamically. I'm betting that this Alexa company gets the urls that are posted for viewing and then goes out to grab the site's pictures manually, I tried 4 sites in my own town and none had pictures, but said "Coming soon" where the pic was to be.
I highly doubt they do it manually. I would say it's more likely that the first request for a site gets it added to a queue to be grabbed at some later date and is then periodically updated unless no requests are made for it after a certain period. But I'm just making a slightly educated guess.
-- Stuart
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