Facebook has continually shown willing over the last twelve months to improve its mobile apps for the greater good of its users. With more than 1.0 billion active users, a large percentage of which access the service from one of the company's smartphone apps, it's only right and proper that the world's largest social network continues to invest in mobile. Now, it seems that investment is starting to move across to the world of music as Mark Zuckerberg's company starts to roll out a new Music Stories post format within its iOS app.
