App developers would have been able to receive information that people have shared on their profiles—things such as their likes, their city, where they live, and that kind of information.
We've made changes since then, and those were pieces of information that were shared under the privacy settings of the person affected. You would have had the ability to choose whether to share the information in the first place. You would have had the ability to choose who to share it with, so you might have shared it with some friends but not others. And you would have had the ability to choose whether those friends could bring that information to apps.
As I mentioned, since then we've significantly restricted the amount of information that's available to apps.