The only creepy thing is that Facebook doesn't know the person is dead. So every year, you get a birthday reminder from a dead person. And that can be troubling.
Not as troubling as if a family member decided to post from that profile AS the deceased person, even with the best of intentions. (Fortunately I have yet to personally experience this).
But, it raises the question. Would you ever un-friend a dead person? Why or why not?