Disable sharing of playlists in Spotify App On Spotify for Windows, there is a setting "Automatically make new playlists public", which I disabled, since I don't want to do that.

In the settings on the Spotify Android App however, this option is missing. Or at least I am not finding it.

Does anyone know a better way to keep my playlists private than manually clicking "Unpublish" for every new playlist I add?
Just go to settings and enable "Private Sessions" That will disable sharing of the songs you listen to.

Steps to enable Private sessions- 


  Step 1: Go to the Android Market and update your Spotify app.
  
  Step 2: Launch the Spotify for Android app, then in the lower
  right-hand corner, tap on "More," then "Settings." 
          
  Step 3: Check the box next to "Private Session." 
  
  Step 4: When you go back to your playlists, you'll see the "Private
  Session" indicator at the top. 
                     
  
  That's it. Now you can listen to Spotify without advertising your
  playlists to your Facebook friends. Keep in mind that after 6 hours of
  idle time, Private Session will automatically disable itself.