A common phrase seen on myspace profiles signifying that the person with this comment has recently tried to "ADD to Friends" someone and they accepted. Also, a polite way of saying "I don't know you or anything about you, but hey, thanks for taking an interest in me..."
%WoRlD Of sORrOwS% would like to be added to your friends.
--goes to profile of %WoRlD Of sORrOwS%--
--clicks Add Comment--
--Types "Thanks for the add!"--