YouTube privacy settings can make channel subscriptions, received likes on videos and saved video playlists hidden.
Here is how to enable these settings :
Login to YouTube and click on top right square. From the dropdown menu, choose the gear icon. Alternatively, go to https://www.youtube.com/account
From the Privacy section, under “Likes and subscriptions”, enable the tick marks next to settings which keep saved playlists, liked videos and subscriptions private.
All done.