You can click on the search bar and search for spotify:user:friends-username replacing the username with the UN of your friend.
That will bring you to their profile where you can follow them and subscribe to their playlists.
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Yes, but you need to know your friends usernames which is a little tricky sometimes.
If you friends have Spotify accounts, and therefore unique userames then you can search for them in the way Anthony mentioned above. For example you should be able to find my profile using:
If your friends created their Spotify accounts using Facebook, then their usernames will be all numbers. If that is the case the easiest way for you to find their profiles is to get them to send you a track/playlist since you can easily navigate to their profile from your inbox!