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.
And thank you mate, think it was your original tip that led me to Smoggy!
You won't be dissapointed, I just got lost in a spreadsheet for an hour. I and LOVED it