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Facebook was the most used monthly mobile app worldwide Q12022.

WhatsApp was the second. Instagram was the third.

I bet the fourth will blow your mind...

It's Facebook Messenger.

Do you have a source for this? I find it hard to believe.

Me too but I have no idea what large foreign market are using.

AppAnnie is the source, but you could use Facebook earnings as the source too as they reported 2.9B active users last quarter.

Only two companies in the world have apps that scale to 2+ billion users. Google and Facebook.