Design + instrument community handoff points for product-led growth: community drives top-of-funnel (members → free → paid), product virality (in-product community surfaces), and post-purchase retention. Examples: Notion's template gallery + Champions; Figma's Friends program; Webflow's University + forum; Linear's Slack community. PLG metrics: K-factor, time-to-aha, activation%, retention curve, NRR. PostHog event instrumentation; webhook fan-out to community platform on PLG milestones.
