Go to settings / usage. It should show you what apps are taking up how much space on your phone. Also, if you're using the new "memories" app with Facebook (shows you synced / private photo stream) this may or may not be using some memory, and is not required to actually be on your phone to use the app.
Twam911, I know how important it is to have enough space on your device and let's work together on getting this issue resolved. Have you tried resetting the settings on your device? http://vz.to/1On3OT6
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