Spotify requires that you connect your Spotify Account to Juicer before it will allow us to pull in tracks for artists or from your own profile.
Spotify posts, much like Pinterest, will all appear at the top of your feed when you first add it as a source. But if you let your feed run for a few days and pull in new content automatically, the new posts will be spread more evenly (chronologically) through your feed.
Artist: Pulls in the top tracks from an artist and displays them in your feed
Your Top Tracks: Pull in the top tracks your connected Spotify account has been listening to. Spotify will update this list every day or so (it doesn't happen in realtime) so over a few days, if you are listening to a lot of music, you will see new top tracks pulled into your Juicer Feed.