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.
Fear not, LB is awesome! As for buying bitcoins, I always use Coinbase, not sure is it the best option, but it worked for me.→