we do not share your data with anyone and there are many ways to control the visibility and storage life of your data here.
but the internet is a public space and you should always assume your data could be compromised.
be smart with your password, use tor or a vpn, and use pgp for sensitive communications.
I have researched this one a bit. 23 and me is pretty easy and convenient but it is incomplete and can be a little misleading. I suggest you get their test and then run your data through promethease for better insights. I'd be happy to help anyone that needs it.
Too right I recently got the result that I have a "32 percent increased chance” of developing Parkinson’s disease. Freaked me out for some time till I learned that means I have a 2% chance of getting the disease.
You don't need to bother with 23andme and their prices (several hundred bucks if I recall). If you are willing to share the data (and let's face it that's gonna happen anyway) you can get a free sequencing from the Personal Genome Project.