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Of course were Instagram and WhatsApp competitors. Not on the service side but at the user base. FB users switched to Instagram and WhatsApp, that's why they bought them.

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They didn't "switch" they just _also_ used those apps, which meant they were competing for people's time.

If they spend their time on Insta instead of FB, they switched. You don't have to delete your account if it's enough to abandon it.

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