Hmm.. have you tried logging out and back in again? Or clearing the cache?
Hope this helped :)
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Whats a Spotify Rock Star?
Do you follow those friends in the desktop client?
I am wondering is this the same issue as on iOS where you can only share to Facebook friends.
PeterSpotify Community Mentor and TroubleshooterSpotify Last.FM Twitter LinkedIn Meet Peter Rock Star Jam 2014
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