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Instagram has very limited parts of the application written in RN, like 'Edit Profile'. [1]

The vast majority of the app is implemented natively.

[1] https://instagram-engineering.com/react-native-at-instagram-...

That article is 3 years old, but it mentions "Photos Of view", "Post Promote", "Save Posts", "Checkpoints", "Comment Moderation", "Lead Gen Ads", "Push Notification Settings", and "SMS Captcha Checkpoint". At any rate, I'm curious to see how this has evolved over the past 3 years and I remain impressed with their seamless integration of RN and native.

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