I have an installation of Mint 17 Mate on one of my machines that has facebook files in it in the usr directory. Computer was wiggy one day after using a forum and I searched the system for facebook and there they wuz in /usr/
I may have used facebook for several months back in April/May/June and there were files in there from then.
I thought I got rid of it when I changed my settings to don't bother me any more.
Not sure how it works. Apparently It left some files behind. Or when I signed
into a Mozilla Forum some of those files may have been left too. I noticed that the forum was using facebook for something. None of those files looked like programs but rather data and images. Ya think it is safe to just delete everything with facebook in it or what would be the best way to rid my machine of facebook short of OS clean install? I'm on different box now otherwise I'd have copied what was in /usr/ and put it in here. Thanx %(

I am a Facebook user and never have anything Facebook installed in /usr. This would need root privileges anyways, so you must have installed some Facebook related package (possibly a chat client?) and you must have explicitly allowed writing those files to /usr.
So the proper action would be to think about installed packages first, before removing anything.
Also, I am really curious, would you mind to post a list of those files?

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It said 30 and I count 30 files and they look the same.
I did not intentionally install these but rather just fumbled through with using Facebook to play publishers clearing house. But before this and even after I've had feelings that someone makes attempts to crack in and look around. Maybe it's just happening on memory. I don't have the mental wherewithall to keep up with monitoring security my having dementia and all.
Do lemme know what you think Thanx SW

/usr/lib/x86_64-linux-gnu/gthumb/extensions/facebook.extension
/usr/lib/x86_64-linux-gnu/gthumb/extensions/libfacebook.so
/usr/share/glib-2.0/schemas/org.gnome.gthumb.facebook.gschema.xml
/usr/share/gthumb/icons/hicolor/16x16/actions/site-facebook.png
/usr/share/gthumb/ui/export-to-facebook.ui
/usr/share/gthumb/ui/facebook-album-properties.ui
/usr/share/gthumb/ui/facebook-export-completed.ui
/usr/share/gthumb/ui/import-from-facebook.ui
/usr/share/icons/Mint-X/apps/16/facebook.png
/usr/share/icons/Mint-X/apps/16/goa-account-facebook.png
/usr/share/icons/Mint-X/apps/22/facebook.png
/usr/share/icons/Mint-X/apps/22/goa-account-facebook.png
/usr/share/icons/Mint-X/apps/24/facebook.png
/usr/share/icons/Mint-X/apps/24/goa-account-facebook.png
/usr/share/icons/Mint-X/apps/32/facebook.png
/usr/share/icons/Mint-X/apps/32/goa-account-facebook.png
/usr/share/icons/Mint-X/apps/48/facebook.png
/usr/share/icons/Mint-X/apps/48/goa-account-facebook.png
/usr/share/icons/Mint-X/apps/scalable/facebook.svg
/usr/share/icons/Mint-X/apps/scalable/goa-account-facebook.svg
/usr/share/icons/oxygen/16x16/actions/im-facebook.png
/usr/share/icons/oxygen/22x22/actions/im-facebook.png
/usr/share/icons/oxygen/32x32/actions/im-facebook.png
/usr/share/icons/oxygen/48x48/actions/im-facebook.png
/usr/share/kde4/services/searchproviders/facebook.desktop
/usr/share/linuxmint/mintinstall/icons/prism-facebook.png
/usr/share/linuxmint/mintinstall/installed/prism-facebook.png
/usr/share/pixmaps/pidgin/protocols/16/facebook.png
/usr/share/pixmaps/pidgin/protocols/22/facebook.png
/usr/share/pixmaps/pidgin/protocols/48/facebook.png

Those are just a few icons and text files, installed by some of your applications, nothing that would in any form or way have influence on speed or behavior of your computer. Deleting those manually might upset your package manager a bit and they would be reinstalled next time those packages are updated anyways, so it would be better to leave them alone.

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You could always do this to find out what packages those files may belong to.

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X?X?X?X?X?X?X?X?X?X?X?X?X ~ $ dpkg -S /usr/share/icons/Mint-X/apps/16/facebook.png

mint-x-icons: /usr/share/icons/Mint-X/apps/16/facebook.png