There are many issues about sharing a persons personal medical data with other organisations and companies, some issues are big and others are much smaller. For me, it causes many issues. I'm not afraid to share with the world that I have a heart condition, caused by a lack of fibrillin gene meaning my aorta just keeps expanding. In fact, that's pretty rare in itself, admitting it can stop people wanting to hire me, because even though it's controlled - I pose too much of a risk.
When I imagine my own kids one day going through my "box" of memories I realise that there is no box. Even my inbox they won't have access to. Emails have replaced letters, pictures on facebook have replaced photographs, iTunes downloads have replaced CDs which in turn have replaced tapes and records - and then there's the Kindle.