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My apps is lacking while I'm using the apps like FB, I found out the apps is only 14++MB, but I check on the usage is about 500++MB, how do I remove the data without remove FB apps?
You can't delete the app data without deleting the app. Just reinstall it and start from scratch.
No, not unless the app has a setting for that. Otherewise, the app won't work.

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