I am very worried about the long term implications of private genomic data warrehouses like 23andMe and Ancestry. What is a fun novelty today may have very serious implications down the road for privacy and even health. For example, if people are given a 'low risk' profile for diabetes or obesity, it may impact behavior (they could eat more, thinking, "It's ok, I have low risk!"), even though this 'low risk' evaluation has little to no clinical relevance. At the same time, some of these companies will partner with researchers to help inform disease gene discovery, propelling personal/precision genetic medicine, which is potentially a very positive thing. So it's a mixed bag. I think we will learn a lot about data privacy and policy in the next few years as Facebook faces additional regulation- hopefully direct-to-consumer genetics companies can avoid some of these privacy challenges and politicians can be more proactive about putting laws in place that protect individuals and their data.