@flo Ahh, I see. Well I’ve used MySpace (a while back but not recently), Facebook, LinkedIn, and a few others and I’ve never noticed one that changed my settings from private to public just because I did something particular over and over again.
Facebook does change their security stuff by adding new things and then you have to opt out, but that’s not related to what the users do, it’s just a matter of their updates. Personally, I think you should have to opt in to some of those things and that they should advertise it a bit more, but the options are still there and once you set them, they don’t get changed (at least mine have never been changed).
I haven’t used MySpace in quite some time now, but when I did use it, I never saw it change my settings either.
I only use LinkedIn for professional stuff, so I’m a bit more open with it than my other stuff. Even with it, I’ve never noticed my preferences being changed.