1. A computer program product for managing email content in an activity stream, the computer program product comprising: a tangible computer readable storage medium comprising computer usable program code embodied therewith, the computer usable program code comprising computer usable program code, when executed by a processor, to: receive a selection of a number of criteria that distinguish email content to be displayed in the activity stream from unrelated email content to be displayed in an email network, wherein: the email network allows users to communicate via email messages; and the activity stream is a separate channel from the email network and presents notifications and updates to content selected by a user; retrieve, based on satisfaction of the number of criteria, the email content to be presented in the activity stream based on the number of criteria; send metadata relating to the email content to be presented in the activity stream from the email network to the activity stream to be presented, wherein the metadata includes information to identify the email content to be presented in the activity stream; display the email content in the activity stream by referencing the metadata related to the email content to be presented in the activity stream; and prevent the email content to be presented in the activity stream, from being displayed in the email network.