Also somewhat related to this - recently I've realized that this privacy paranoia is going to slow down medical advances coming out from big data so much.
For example your wearables get to collect so much biometric info, if that data can be connected to detecting conditions early it would provide a lot of value down the road. At some point we will have the option to collect data about what you ate, what you did, where you went and then how that affected your biometrics, and we can inexpensively collect huge scale DNA samples, etc. all that data if available publicly could really provide insights in to things that are really not practical in limited group studies.
For reasons such as this I think I'm fine if services collect anonymized (unless we solve identity theft and such security concerns) information about me, I'd just want them to make this data free.