I had a high school teacher once tell me, "Never write anything down you would not want published in the local paper". This was before the internet and smart phones. It seemed like good and not very restrictive advice that I used as a heuristic for many years. Maybe at that time there was a better balance between personal privacy and society's right to know things about you. Equivalent advice today might be, "Never say or do anything within 100ft of a smart phone or put into a computer anything that you would not want everyone in the world to be able to see now and at all times in the future." That is quite a bit of change and I would feel unjustly controlled following this heuristic.