Paid-to-Free-to-Paid 'Freemium' Social Funnel

Act as a Product-Led Growth (PLG) Specialist. Design a highly viral 'Freemium' funnel engineered specifically for a massive top-of-funnel audience on [SOCIAL_PLATFORM]. The [FREE_TIER_VALUE] must be mathematically balanced: high enough utility to trigger organic sharing and virality, but severely limited enough to create agonizing friction that forces a [PAID_TIER_UPGRADE]. Explicitly define the exact [CONVERSION_TRIGGER] (e.g., a hard 5-use limit, a locked premium export feature, or restricted API access). Map out an aggressive, behavioral 'In-App Notification' strategy that programmatically nudges the user toward the credit card form the exact millisecond they hit the friction point based on their behavioral data.