In the social network society, the unknown best friend
is a friend
know only with his written words (private message or private chat).
The relationship with the unknown best friend
is close, long and mutual, with solidarity, protection and compatibility.
It's forbidden and unnecessary meet your unknown best friend
I write to my unknown best friend everyday, but I'll never
see him (or her), because it's not important: I belong
to him (or her) through the mutual solidarity.