Its not clear what this is. May be I am overthinking this but it could be one of two -- 1. Is Instagram collecting a lot of data and sharing 79% of that with t

Its not clear what this is. May be I am overthinking this but it could be one of two -- 1. Is Instagram collecting a lot of data and sharing 79% of that with third parties on their end? 2. Is Instagram collecting 79% of the user data available to third party apps on iOS? If it's 1, as I suspect it is, then is it through their ads sdk? If so, how does an external entity get this estimate of 79%? So many other questions come up too. Why is it listed separately from FB app? Do they have a separate ad sdk for Instagram and FB? I thought the number just means that Instagram is more valuable to services and so buy more there.