Have you installed the August 2013 update for Facebook Camera? See
https://itunes.apple.com/us/app/facebook-camera/id525898024?mt=8If you haven't already installed the update, that's the first thing to try....and if you updated Facebook Camera BEFORE you upgraded to Mavericks, try reinstalling that update, or even the whole program and the update.
If that doesn't work, leave another message - I'll be checking back.
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