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Define "Retain" average 3 months, 6, 12?
Then conversions, 1-100 or 1-1,000 off what traffic?
But the biggest thing to me is how much traffic it drives. How much traffic from a source can be sent by the "day" against another site.
This is like saying a Ford is better than a Toyota. All fucking irrelevant until you get to specifics.
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