the 70 char line limit

[Baloff]

Hello

I have this line in my .emacs
(setq fill-column 70)                  ;Text lines limited to 70 chars
but it does not go to new line when I excced the 70 char limit.
how do I get it to do this.
this is helpful in psoting since most of you reading posts can display 
70 char with out having to skip over long blanks to catch the rest of
the sentence which may happen to be on the middle of the next line.



thanks