About a year ago, I made a playlist and my friend (who didn't follow me as a user, just the individual playlist) followed the playlist. I then made the playlist collaborative and we began to add songs to it. I never took notice to if the playlist ever came up on my profile or not, but from what I've read, it is supposed to be private. When I look at my profile now, the playlist does not come up under "Public Playlists", although I do share my activity on Spotify. However, the playlist now has 20 followers, yet my personal account only has 11 followers. These followers have not always been following this playlist, and I don't know who they are or how they found the playlist. Did they possibly find it through my friend's profile since he was following it? I'm not concerned, just confused.