Welcome pstubbs! This is a great question. There actually isn't a distinction between the type of activity you're doing and the data that's consumed - basically, any activity you perform on your device (browsing, streaming, uploading all the pictures to IG, podcast bingeing) that requires a data connection will use "high speed data".
Is there a reason you ask? What type of plan do you have?
I ask because I'm currently on the simple choice plan with 2GB of data. I was under the impression that pandora did not count toward the "high-speed" data. So I was just asking if there was a differentiation in services before issue of the bill so I could better use my data before getting "slowed-down".