On an information and entertainment platform, an interaction might be the click-through that takes a consumer from a headline to a complete story; on a marketplace platform, it might be the purchase of a product; on a professional networking platform, it might be the offer of a recommendation, the swapping of contact information, or a posted response to a question on a discussion page. Any of these interactions would signify a greater degree of engagement by the user and represent the moment when the user has recognized, used, and enjoyed a value unit available on the platform.