I was on a call the other day working on a family project when the other party asked for my cell phone number. I handed it over on two conditions: (1) she throw it away after the project was completed, and (2) I made her swear to not enter my cell phone number into any computer. Immediately following this conversation my girlfriend overheard me muttering, "Computers are dangerous." Let me explain.
When it comes to preventing information leakage … the best rule is: "Don’t ever let the data be placed into digital form."
Then for extra protection it is best not to ever speak it. And, in coming years, it will be best not to ever think it either. (See P300 post below)