Now that makes sense iani, if what I predict below is correct about FB and the fact that Spotify have secured a US deal with Sony and EMI + they might buy Warner Music. All of these put together would give them a tried and tested advertising model away from search ads, at better margins than Apple. Plus maybe musicians would possibly feel better, as less companies are taking cuts before the musicians get paid. That said Spotify have 1m paid customers and musicians are sort of only just understanding this new model...imagine their tunes were selling (bought or in exchange of an add) to 550m+ listeners. Plus why do you want a Spotify app when you could access it all from FB. Love it or hate it, but for the end user simplicity counts.