When's the last time you listened to Spotify on your PC? It might have been a while, according to the company's latest stats. The streaming music service says that 52 percent of listening now takes place on phones (42 percent) or tablets (10 percent). It's not clear how many people listen primarily on these devices, but there's little doubt that both free shuffle-only mobile streaming and carrier bundles played a big part in the shift. Those who use both mobile and desktop apps tend to listen a while, too -- they stream an average of 150 minutes every day, or longer than two large albums. With that kind of interest, don't be surprised if Spotify takes a page from Facebook and pours more of its energy into your away-from-home experience.