Decide who gets to see your posts

Facebook reintroduced selective posting in this privacy update. Once you write your status, click on the small triangle next to the Post button to make the post visible to friends, public (anyone on the Internet), or custom (exclude individuals or lists).

To change the visibility after you've posted, head back to the post on your wall, hover over it, and click the drop-down menu in the upper-right to change the visibility.