Facebook is not selling this data too, afaik. It's too valuable. They are using it to target paid ads. Apple's ads business is still in its infancy, but it will

Facebook is not selling this data too, afaik. It's too valuable. They are using it to target paid ads. Apple's ads business is still in its infancy, but it will inevitably grow bigger to justify their share price. I beleive, however, that at least their music recommendation system is lavishly fed on their social graph data.