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It's also useful if you have a second musical "life" that you don't want to involve in your recommendations. Parents with kids' music, for instance. In my case, I turn on private listening when I go to bed, because my sleeping music is repetitive and nothing like the music I want to discover.

Of course. But even then I wouldn't want the session to end without confirmation. A prompt/reminder after six hours would make sense.

Wait wait wait, Spotify notifies my friends of what I am listening to (not a user, so honest question)?

No no, but in the UI you can see what your friends are listening to (if you're added as friends). Example I found online (the right bar is the friends feed):

https://miro.medium.com/max/3836/1*C_ImLXQdMOGljMRhLcV-Yw.jp...

And to be clear, this is an optional feature.

Appreciate that clarification. Good to know.