Once you've edited your privacy settings, click on the "Apps and Websites" tab for a list of applications connected to your account.
To see what permissions these apps have been granted, put the app's name in the search bar and click. That will bring up what this app is authorized to do. You can then edit those permissions or delete the app entirely. If you delete it, you can also have the app remove any posts it has published on your behalf. You can also turn off the ability to have any app interact with you on the site.
Notably, this exercise helps, but it doesn't completely protect you from privacy violations. Other online companies from social networks to Google are also collecting information on you -- from the things you share on the websites you visit to the songs you play on Alexa. It's almost impossible to avoid this sharing without becoming a digital hermit, said Wisniewski.
If you don't want to end all online activity, you should at least be aware that anything you post or publicly search for goes into the public domain.
"When you post something, you're giving up your privacy," said Bearak. "You need to be aware that this information doesn't really belong to you, and it may be used for other purposes."