Whatsapp and Twitter take up too my space on my iPhone?

I have an iPhone 5s 16GB and basically my whatsapp takes up 900 mb and Twitter takes up 700 mb. Is that even normal? How do I fix that?

Delete them.

Only way those apps would take up as much as that is through cache memory or in WhatsApp's case media from conversations. You could get apps like Phone Clean to clear out that cache or delete them/reinstall them. In Twitter's case no harm no foul, but of course you'd lose everything with WhatsApp.

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