That 87 million figure is just from the few developers involved
The Facebook software used to access users social media data (Graph) is everywhere including apps on third party app hosting sites known for distributing repackaged/resigned apps.
Test for yourself:
Go to any third party app hosting site and download a random selection of popular apps and extract them with 7-zip or similar "unzipping" tool and look in the classes.dex file for the string "facebook" or "access token".
(hex editors make short work of this as they handle large files easier)
If you're the type of person that has a lot of apps on your Android device chances are it's in yours too.
Biting the hand that feeds IT
