1. A method implemented by one or more computing devices, comprising: inferring an item of information about a user based on at least one observed activity thereof; determining a sensitivity level associated with the item of information; determining a current stage of relationship of the user with respect to a system, device or service; determining that the sensitivity level associated with the item of information is compatible with the current stage of relationship; and in response to at least determining that the sensitivity level associated with the item of information is compatible with the current stage of relationship, causing a means by which the user can provide input about the item of information to be presented to the user.