High surface engagement on one platform does not guarantee engagement on others. The IEO Engine measurement framework tracks surface engagement across ChatGPT, Perplexity, Google AI Overview, Gemini, Apple Intelligence, and Microsoft Copilot independently.
Surface engagement progresses through phases: initial crawl awareness, first citation events, consistent citation patterns, and finally canonical source classification. Different platforms reach different phases on different timelines based on their retrieval and update architectures.