Maybe it's just me but there's something deeply disturbing about the idea of Google also hoarding medical data...
Having seen that abuse first-hand, Google is still one of the better ones when it comes to having good internal safeguards and policies -- but they get so much attention for their scale and breadth of data.
Which will be hacked in 2 weeks of its existence..
If you have ever googled a symptom, they know, and unlike HIPAA there is no regulation on what they do with that data.