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Had the same question. Is it the in app web view? Wouldn't that be safari/chrome depending on platform?

Well, yes and no. They have their own user agent, so they can get their own classification. e.g.

Mozilla/5.0 (iPhone; CPU iPhone OS 13_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 [FBAN/FBIOS;FBDV/iPhone11,8;FBMD/iPhone;FBSN/iOS;FBSV/13.3.1;FBSS/2;FBID/phone;FBLC/en_US;FBOP/5;FBCR/]

Identifies as "Facebook Browser".

See: https://developers.whatismybrowser.com/useragents/explore/so...

I think Google Analytics picks this up as "Safari (In-App)"

If this classification was not possible, Edge would identify as Chrome. (since it uses Chromium engine)

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