Try not to panic, but it turns out that Spotify artists actually receive notifications when you add their music to your playlists.
Apparently the notification tells the artist the name of your playlist, which is why Spotify users are ~*a LiTTLe NeRvOuS rN*~.
Now people are sharing their most embarrassing playlist names, because you can't put the genie back in the bottle. What's done is done, ya know?