I was just going through my SGS7 and moving whatever apps i can to the 128GB Micro-SD card. 

I hit "F" in the list....and found that Facebook is 242MB + 23MB of data and it can't be moved anywhere or uninstalled because it's part of Samsung's preloaded software. 

Fark.....

I may look at rooting this phone sooner rather than later if space becomes an issue.