Android Developers released a video onto YouTube on Monday visualizing global Android activations, spanning from the launch of the first Android device (T-Mobile G1) back in late 2008 up until January of this year. Some of the areas with the strongest Android adoption include the US, UK, Netherlands, Switzerland, Belgium, South Korea, Taiwan, Hong Kong, and Japan.
Keep in mind that the visualization shows activations only, so there is not always a constant indicator of how many activated Android devices exist at any one time in total.
At certain points, you can see significant jumps in device activations, which coincide with major product launches, such as the launch of the Motorola Droid and Samsung Galaxy S.
North America, Europe, and Asia are also shown more closely so that users can get a closer view of the areas where Android has really taken off and become a popular smartphone platform.
Image from Engadget