Most Facebook users know that Facebook knows a lot about them but most do not know what this includes.
Some information are obvious; the things you post online or information that you have added to your profile.
Others, like interests, IP addresses, facial recognition data or photo metadata may not be as obvious or not accessible on the site at all.
If you want to find out what Facebook knows about you, you can request a copy of your data from Facebook to analyze it on your local computer.
While that does not include everything, it includes a lot that you may find interesting.
Download your personal Facebook archive
The first thing you need to do is request that Facebook generates a personal archive for you:
Facebook generates the archive in the background. Depending on how much you have posted and uploaded to the site and interacted with others it may take a while.
You receive an email on completion that links to a page that you can download the archive from. Before you can do that, you need to enter your account password once more.
Analyze the archive
Extract the contents of the zip archive to your local system and load the index.htm file afterwards in a web browser.
This is a basic HTML file that requires no Internet connection. You find pages listed on the left and the information that the selected page offers on the right.
Here are a couple of entries that you may find interesting:
As you can see, not all information listed above are accessible directly on Facebook. The archive is the only way to gain access to the data.
While it is interesting in itself, it may help you uncover security issues on Facebook. Since all IP addresses, account sessions and cookies are listed, you may use it to identify unauthorized access to your Facebook account.
Update: You may use this browser extension for Google Chrome instead to display the information Facebook has stored on you.
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Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.