Based on artists in the playlist.

When we recorded the update, the playlist could have been updated before.

We record the number of followers of each playlist once a day. If you see a sudden spike or drop, this could indicate fake followers.

The popularity is a value from 0 to 100 given by Spotify. The higher this number is, the more popular the track is. This graph gives you an indication if the playlist contains only popular tracks or tracks from upcoming artists.

For each track in the playlist, we look at the release date, and we then build this graph. This gives you an indication if the playlist contains new released tracks or older tracks.