I know what you mean, but i'm afraid the answer is: none!
You can meet with people in real life ;)
When it comes to privacy, our technology is spoiled from the very bottom...
it's just the way the internet and pc's are designed nowadays.
But i'm talking about no-compromise-whatsoever- kind of privacy.
You can have decent privacy with computers if your friends care about privacy
too, at least decent for the average guy.
If you want to exchange really 100% secure messages for instance, you can use
the so called "one time pad" encryption; it is mathematically proven to be
100% secure and cannot be cracked, no matter what computational power the
evesdropper has got.
However, you have to transmit the key in real life, and the key has to be as
long as the message!
and you have to encrypt the message in real life as well... so... it's no fun
to use :P
