Then how did you post this?
Simple. His computer and the server must be one and the same.
Time to update the Miranda warning to include: 'Anything you Tweet or post can and will be held against you in a court of law'?
Sorry but courts allow emails to be introduced as evidence so long as authenticity can be established. Why shouldn't this hold true for tweets and facebook posts? This has absolutely nothing to do with Miranda.
The problem comes with the numbers. You say the average person is not so dumb, well, half of the people are dumber than that.
Hate that quote... grumble, grumble... MEDIAN... grumble, grumble.
You will be successful in your work.