According to Podtrac.com, iHeartRadio showed the greatest growth after purchasing HowStuffWorks. iHeart is now #2 on the chart. All of the top 10 publishers showed gains in their unique US monthly audience in October over September. Total global downloads for the Top 10 publishers is up 26 % in October over September. And, total global downloads for the Top 10 Publishers is up 73% year-over-year.