MaxSerial - MAX232 based serial board

Hi

I am sorry ,but I didn`t understand why all grounded point leaved without any ground connection,should I add a ground plane to the board.

I maked freeduino v 1.2 and after that I noticed that grounded points has not any ground connection ,so I redesigned it,but want to know what was the designer porpuse to leave all grounded points lonely.

Ray