(UPDATED) Pandora just shared monthly metrics for January 2013. Listener hours for the month hit 1.39 billion, an increase of 47% from 952 million during the same period last year. But active listeners dropped to 65.6 million from 67.1 in the previous month. Pandora's share of total U.S. radio listening is now at 8.03%, an increase from 5.55% at last year.
Active listeners were 65.6 million at the end of January, an increase of 38% from 47.6 million during the same time period last year.
Pandora is now releasing key audience metrics on a monthly basis.