According to a recent tweet from Sony Worldwide Studios President Shuhei Yoshida and a press release from Sony, the PS4 has sold through over 1 million units within 24 hours of the launch in North America.

"Sales remain very strong in North America, and we expect continued enthusiasm as we launch the PlayStation 4 in Europe and Latin America on November 29. We are extremely grateful for the passion of PlayStation fans and thank them for their continued support."

Here's the tweet:

PS4 has sold through over 1 million units within 24 hours of the launch in North America!!! :D
— Shuhei Yoshida (@yosp) November 17, 2013

Some context:

• At launch, PlayStation 3 sold 0.19M in 2 weeks in the US. It took them about 50 days to ship 1 million units in NA
• Wii sold 1.25M in the first 42 days in NA
• Xbox 360 sold 0.9M units in the first 39 days in NA
• Sales graph: (First-Month Sales Data)

Thanks to Neogaf for the numbers and the graph.