> Google will argue that while this data is intimate (religion, age, personal preferences), it is not personally identifiable.
IANAL but I would assume that all it takes is one incident of it actually being personally identifiable to erase this argument. All it takes is one data point that is "unique enough" to map it to one person. Imagine a very unique combination of these three values (religion, age, personal preferences: muslim, 21, likes curling) and add an equally unique location (Iceland) and you may be in trouble.
IANAL but I would assume that all it takes is one incident of it actually being personally identifiable to erase this argument. All it takes is one data point that is "unique enough" to map it to one person. Imagine a very unique combination of these three values (religion, age, personal preferences: muslim, 21, likes curling) and add an equally unique location (Iceland) and you may be in trouble.