First, run a privacy check
Privacy settings are confusing as hell. Facebook knows this, so it went ahead and built a widget that walks you through your current settings and shows you how to tweak things along the way. On a computer, log into Facebook and click on the padlock icon in the upper right-hand corner of your homepage, select "Privacy Checkup," and follow the steps. This should cover some of the big bases, but there's a whole lot more to pay attention to, so keep reading.
See how your profile looks to other people
Curious what exactly strangers see when they stumble across your profile? Go to your profile page on a computer and select "View As" from the button with three dots at the top right. This gives you the option to see what part of your profile is visible to the public, as well as to specific individuals.
Control who's seeing your stuff on a case-by-case basis
If you'd prefer to restrict your audience for a particular status update, photo, or video post, it's easy. Click the menu at the top of the post and you'll notice the option to select between Public, Friends, Only Me, or a custom group. And while we're at it, it's worth mentioning that if there's a particular status/photo/video/etc. you want to deploy without it posting to your timeline, select "Hide From Timeline" from its drop-down menu.
Post to a specific group of friends
If you find yourself frequently broadcasting to a particular crew (co-workers, teammates, etc.), you can create custom Friend Lists, which essentially become mini LISTSERVs. To make one, click on the Friends section on the left side of your screen (while logged in on the desktop version of the site), and click "Create List," at the top.