I could care less if someone or the whole world knows that I like elvis presely, fence repair or cucumbers and gardening and a whole host of other random facts. i mean so what? that data can go out of date very easily. any second now I could decide I don't like elvis presely, etc. the vast majority of "data" collected is all nonsense anyways.
the things I don't want getting into anyone's hands are things like: financial info, address, phone number, social security, my middle name, birthday, etc. none of those things are stuff I share with a social network.