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.
+1 for the idea of a forum. Unfortunately I think there is a rule whereby you are not allowed to link to other websites here, but there should definitely be a back-up plan and a back-up plan for that backup plan.→