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.
It's uneconomical to mine BTC with anything less than a server farm and/or a very low cost of electricity. However you can mine some new alt coins with a single PC. It's actually a fun and cheap way to bet on them.→