Who started “Harry Potter and the Deathly Hallows book release”?

DeepDiscount.com customers, on Retail, Jul 17, 2007. It reached 4 platforms in 3 months.

LineageContestedKey steps, 10 of 16. Lines follow time and platform
PrecursorDeepDiscount.com customersFirst postPlatform jumpPlatform jumpPressOwner responseBacklashCommercialPlatform jumpMilestonePatient zero