1. A method comprising: collecting, by one or more computing devices, a plurality of information items of a plurality of types relevant to a user, wherein: the information items are collected from a social-networking system; and the user is a member of the social-networking system; determining, by one or more computing devices, a relevance value for each of the information items; classifying, by one or more computing devices, each information item as being deterministic or non-deterministic based at least in part on the relevance value; sending, by one or more computing devices, one or more push notifications to one or more client devices associated with the user, the push notifications comprising one or more of the information items classified as non-deterministic sent in an order of their respective relevance values; and storing, by one or more computing devices, the information items classified as deterministic for later retrieval by the user.