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.
no idea if it's any good mate, I've always just used localbitcoins.
Can get coins in minutes, and 2 quid fee to send or something tiny→