"Xmas day was twice as big as our previous high... Def a sign of the growing footprint of devices/mobile."
- A tweet from Pandora founder Tim Westergren early on Monday morning.
Less than two weeks ago the online music service announced that it had topped 40 million total registered users. Pandora says that it is adding 600,000 new registered users a week, 300,000 of whom are mobile -- Pandora added a total of 20 million registered users across all platforms (home, PC and mobile devices) in 2009.
