Early Results: The Open Graph and Music - Facebook Developers
developers.facebook.com/blog/post/594
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Since f8, people have shared their listening activity more than 1.5 billion times with their friends using the music apps that have integrated the Open Graph. As a result, some of our biggest music developers have more than doubled their active users, while earlier-stage startups and services starting with a smaller base have seen anywhere between a 2-10x increase in active users.