I'm curious as to why all of the stats, except business visitors, are open and visible. Is there a reason for this?
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Joel said he didn't set this, so it must be a default at Quantcast. He said he'd look at at and see if there's an easy way to make it visible (the whole point of Quantcast is public visibility..), but the Quantcast UI is not so great.
Two reasons for exposing your stats
Basically you can ask yourself the question, "would the site be better / more interesting / more profitable if this information was hidden?"