Not even two years after reaching 1 million users, social audio service SoundCloud announced today that it has surpassed the 10 million user mark. The Berlin-based company has risen to become a major force in audio content creation and sharing on the Web, becoming a sort of "YouTube for audio" used by musicians, journalists and pretty much anybody with a need to record and share their own audio files.
To celebrate the milestone, the four-year-old startup has released an audio slideshow storytelling app called Story Wheel. It uses the Instagram API to grab a set of pictures, from which you can select the ones you want and order them. Once the photos are arranged, a brief narrative can be recorded in the browser. The end result is a shareable photo slideshow annotated by you.