According to The Verge, "'Diablo 3' becomes fastest selling PC game in history"
In the first 24 hours of release, Diablo 3 sold more than 3.5 million copies setting a new record for PC games sales and that excludes the 1 million+ people who signed up for the World of Warcraft annual pass + Diablo III promotion.
Co-founder and CEO of Blizzard Entertainment, Mike Morhaime said: "We're definitely thrilled that so many people around the world were excited to pick up their copy of Diablo 3 and jump in the moment it went live,".
He added, "We also regret that our preparations were not enough to ensure everyone had a seamless experience when they did so. I want to reaffirm our commitment to make sure the millions of Diablo 3 players out there have a great experience with the game moving forward, and I also want to thank them for their ongoing support."
Wikipedia: Diablo III
TheVerge: 'Diablo 3' becomes fastest selling PC game in history