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Clearing Documents & Data on Iphone 6Plus

I was looking through my storage this morning on iPhone 6 plus and found that some apps seemed to be taking up alot of storage.
For example, Facebook.
App size is 99MB but underneath it says Documents and Data 448MB ?
Whats is this and is there a way to reduce this so it doesn't take up so much space ?

If i have searched the web but can not find anything that explains are to turn this off ?