Public-ize all the things!
On facebook, my friends list is private, but [almost] everything i post is public. My reasoning is this: ultimately everything we post online is preserved indefinitely and will exist until the end of time. So why not? Whether or not we “share” it with our friends, someone will have a copy of that data because of online surveillance at least. It’s moreso philosophical reasoning and obviously it’s impossible to preserve 100% of the information people post online.