in-app-browser
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lesson 343 tok
posthog-js 1.434 labels Instagram IAB (WKWebView) sessions $browser='Mobile Safari'. The IAB has its own cookie jar, so a respondent who later reopens the link in real Safari is a different, cookieless visitor. Query $raw_user_agent for 'Instagram'/'FBAN'/'IABMV' when a mobile user's flow 'didn't come through'.
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