I think that one of the most exciting features of Facebook, invented by its creators or advised by some early adopters-"crazy" Facebookers, is POKE YOURSELF!
So if you have already poked all your friends and not only friends... but still can't tire of socializing- Poke yourself and be satisfied :)
The system wll ask you, of course: "Poke yourself?: You are about to poke yourself. This will appear on your homepage". And be sure to be strong enough to confirm! :)

Keywords: poke, poke yourself, facebook