Disable the fourth setting on the list, Tag Suggestions. It makes it harder for friends to tag large quantities of photos featuring you or people that look like you. But it also takes some of your profile's privacy out of the hands of others.
The last setting on the list is seriously important: It determines whether or not friends can check you in to places. Turn it off. The only thing worse than constantly broadcasting your location is having someone else do it without your express permission.
3. Rein in app permissions
Speaking of permissions, the permission window that used to appear frequently when Facebook apps wanted to access your profile information is pretty much MIA now. Currently, apps need to ask you only once for permission. Once they do, they'll mine your profile information as often as need be, sometimes even when the app isn't being used.
Fortunately, there's a privacy fix. Unfortunately, it's not a quick one, since you'll have to tweak each app's settings individually.
In the main Privacy Settings, click on Edit Settings next to the Apps and Websites entry to bring up the Apps, Games and Websites privacy settings page. Next to "Apps you use," click on Edit Settings again to access a full list of apps running on your profile. Each app is accompanied by an Edit button, which displays the app's permissions when clicked. Each app has different permissions enabled, so you'll have to check each one individually.
Here's the bad news: Some permissions, such as sharing basic profile information with the app, cannot be altered. These are marked by the grayed-out word "Required" next to the particular permission.
Other settings, however, have the word "Remove" next to them -- click on it to remove any permission. These are the only items that can be changed, so you'll have to take a hard look at what permissions an app deems a necessity. If you don't like what you see, click "Remove app" at the top of the same page and learn to live without that app.
For the apps you do keep, it's important to control who sees the information that the apps share -- many of them are designed to broadcast your activities on your timeline and in the "ticker" on the right side of users' home pages. At the bottom of each app's permissions page is another important option entry titled "App activity privacy." Click on the drop-down menu and select Only Me to be sure your app activity isn't seen by anyone else.
Similarly, if you install any new apps, be sure to select Only Me under "Who can see activity from this app on Facebook" on the installation page.
4. Stop others from taking your information with them
The Apps, Games and Websites privacy settings also contain some other features that security hounds would be wise to disable.
Click on Edit Settings next to the entry labeled "How people bring your info to the apps they use." Other users may be able to bring your personal information with them when they use apps and websites. It's all in the interest of making things more social. It can also be invasive. Uncheck the box next to each information category listed (there are 17 of them) to prevent others from using your personal data.
Head back to the Apps, Games and Websites privacy settings and click Edit Settings for the "Instant personalization" category. This option should be turned off by default, but check to make sure. You'll first see a pop-up screen explaining the feature; when you close that, you'll be able to see whether it's enabled. If it is, disable it. This will prevent Facebook partner sites from accessing your public information to personalize your experience on their own websites.