Writing on someone's wall after becoming "friends" with them

Once you have become facebook friends with someone, do you have to write on their wall? Who has to write first, the friender or the one who accepted? Edit this page and add your thoughts.
*If you haven't spoken to someone in years, and they friend you, and you accept, its only appropriate for them to write on your wall with something like a "hey, how have you been?" Otherwise, it just looks like they are friending you to increase their number of "friends." 
Category:Facebook Etiquette
Category:Friending
Category: Wall Posts