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XF 1.5 Facebook-Link in XenForo Source-Code ?


Well-known member
I am wondering:

When looking at the Source-Code of XenForo, I see this Link to "Facebook".
Why do we need this Link to "Facebook" at the XenForo-website ?

Is this a tracker ?
Can I delete this code ?

<!DOCTYPE html>
<html id="XenForo" lang="en-US" dir="LTR" class="Public NoJs GalleryLazyLoader LoggedOut Sidebar  Responsive" xmlns:fb="http://www.facebook.com/2008/fbml">