I try not to stress over this too much. I think most significant privacy breaches are going to be from "hacking" of records on a large scale, not someone perusing scrapbook websites trying to read the tiny journaling print.
That said, I don't gratuitously post a bunch of personal data about us and avoid discussing my children's medical details in public forums. I do have a (long-neglected) blog where I blog about our daily lives but as far as I can tell, no one reads it.