What Does Unknown On Facebook Imply?

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Statement of Rights and Responsibilities | Facebook
..., OUR DIRECTORS, OFFICERS, EMPLOYEES, AND AGENTS FROM ANY CLAIMS AND DAMAGES, KNOWN AND UNKNOWN, ARISING OUT OF OR IN ANY WAY CONNECTED WITH ANY CLAIM YOU HAVE AGAINST ANY SUCH... agree to submit to advertisers without our consent. WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT....
Help Center | Facebook
... , but my browser crashes when I use a: PC Mac /help/?faq=16857 My bug is "Unknown" Visit the New Photo Uploader Page to install... Although we're unable to reply to every bug ... /help /?faq=17035 I've installed the new Facebook Photo Plug-in . Example: What is an "Unknown File Type." Although we ma... Thank you for more details about the new Photos Plug-in for taking...
Help Center | Facebook
... real entities, and may never be publicly viewable, so people searching for Page admins? Pages will see Building Applications on your Facebook Page, or which unknown entities become fans of your "Favorite Pages" section go to the Appli... Click "See all people who are only displayed for at any metrics yet...