The Active Listener Graph shows how many listeners are tuned into your app and playing the stream in realtime. If your stream has metadata you will also see the corresponding playlist items listed and the number of listeners increased or decreased during that song. This is a great tool to help you gauge when you have a song that is turning your listeners away (ahem, My Heart Will Go On).
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The Active Listener graph charts listeners in real-time, but no longer shows them in the chart after approximately 30 minutes streaming. After this time we no longer consider them "active" in the app, and that listening is passive. The streaming minutes are not affected by this, only the graph to show listeners who are most likely actively navigating within the app.