We can say you have three tabs, one where you have your playlist etc, one where you choose the songs, and the last one where you can follow what your friends are listening to. A small button with the function to hide the tabs would be nice and give more space, making the design look better. I use Spotify to listen to music and not to see what my friends are up to, i can use facebook to do that. Also making the private session feature work as a toggle. I am forces to click it everytime i log into spotify if i want to stay invisible.