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.
Give these guys a try, a legit operation that isn't fucked in the head like coinbase, and takes credit cards. Make sure you buy bitcoins aka bitcoin core, not "bitcoin cash" which is a newer currency not so widely accepted yet.→