Well, regarding concerns, privacy and as some call, paranoia there are plenty of reports that the most financially lucrative information for hackers is medical and biological information on people. In fact, some hackers have ended up changing medical records of some people leading to disastrous results. You can find these reports in a simple search.
I think privacy concerns on all sensitive data is always part of a discussion that balances the good of sharing information with how that information will be used.