Facebook status updates generally are sent to all your friends, but there are controls that can customize exactly who sees your update. After typing your update into the Facebook status update box, click on the small lock next to the Share button. Now, you’ll see a drop-down menu that let’s you choose Everyone, Friends of Friends, Friends Only, or Customize. Choosing Customize brings up more choices to specifically include or exclude certain friends. For more detailed explanation with screenshots, read Ask Dave Taylor: How can I limit Facebook status updates to certain friends?
Surfnetkids » Tech Tips » Facebook » Limiting Facebook Updates to Certain Friends