Best answer by Mathis
Thanks for posting about this on our Help Community. I regret to inform you that the feature making it possible for a user to find their Facebook friends from their soundcloud.com/people page while logged in is no longer available.
The reason for this is that Facebook have recently performed some changes to their public API infrastructure making it more difficult for us to retrieve user’s friends list and display them from a SoundCloud account.
We unfortunately do not have the necessary ressources to allocate in order to bring this feature back at the moment.
We hope you understand, apologies for the inconvenience.