Pitch activity shows you how many times that pitch has been played, viewed, and downloaded.
There are a couple of ways to see a pitch's activity:
1. To view the activity from the pitch log, you can right click a pitch and click the Pitch stats option. Then you can go to the Activity feed to view the activity.
2. To view the activity from the pitch edit modal, you can click the more options button in the header and click the Pitch stats option. Then go to the Activity feed.