That's a really good point with respect to advertisers. Even on the competitor level, I'm not sure how they would use that data. So worst case scenario is a co

That's a really good point with respect to advertisers. Even on the competitor level, I'm not sure how they would use that data. So worst case scenario is a conflict of interests between user privacy and business revenue. I think if Facebook wants to take effective action to correct this, they'll go beyond simply restricting the API, and give users options to limit which data of theirs they want to let their friends expose to third parties, because even when the API is shut down, someone willing to violate the terms of service can do quite a bit of data harvesting using fake profiles and social engineering to get people to add those profiles if some of the data seems plausible. Granted, this method is slower, but still possible, and I think currently being exploited based on friend requests I've received through friends. I've asked friends if they knew the person, and they said they weren't sure, but they might because the information seemed similar; this is the same concept as a phone call spam technique known as "Neighbor Spoofing".