Sorry, totally didn't read the part where you said it was in your data/app folder. What you will need to do is, open your command prompt and change directories to your SDK/tools folder. Plug in phone, but do not mount of course.
adb pull nameofyourFBapp.apk /data/app
then rename to Facebook.apk
adb push Facebook.apk /system/app
If you don't use adb, you can try using Root Explorer, not sure how well that works for this kind of thing, although I am not sure why it wouldn't...
i use root explorer. just select move, and move it to /system/app. then rename it to Facebook.apk and reboot. then apply the theme
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