US internet radio service Pandora has passed a registered user milestone of 200 million in the US.

There has been an accelaration of growth in the last two years - it reached 100 million users in July 2011, particularly boosted by usage via mobile devices which has attracted 140 listeners, according to Hypebot. Prior to that it took six years to accumulate its first 100 million registered listeners.

An infographic published by Pandora revealed that it streams over 200 ...