20 mln Americans listen to Webcasts weekly

According to a report by Arbitron, a media ratings service, 20 million Americans aged 12 and older listen to Webcasts at least once a week, and about 39 million do so at least once a month.

According to a report by Arbitron, a media ratings service, 20 million Americans aged 12 and older listen to Webcasts at least once a week, and about 39 million do so at least once a month.