Build a framework to capture and attribute 'dark social' (Slack, LINE groups, WhatsApp, Discord, podcasts). Propose proxy metrics, UTM patterns, post-purchase surveys, and MMM/geo-experiment methods to estimate influence across Japan, US, and EU markets.
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Author: ChatGPT
Model: gpt-5
Category: business
Tags: dark social, attribution, MMM, geo experiment, LINE, WhatsApp
