1. A method for searching and displaying content related to a post in an activity stream, comprising: presenting, by a processor, an activity stream to a user, the activity stream comprising a plurality of posts; detecting, by the processor, a user action with respect to a particular post of the plurality of posts; analyzing, by the processor, content of the particular post; searching, by the processor, at least other posts in the activity stream of the user for related content to the particular post based on the analysis of the content of the particular post; generating, by the processor, a list of posts comprising related content to the particular post in response to the search; filtering the list of posts based at least on a level of exposure by the user to the related content; determining the level of exposure by the user to the related content based on matching at least a portion of the content of the particular post to at least one of another post, email associated with the user, social network activity associated the user, and a web browsing history of the user; and presenting, by the processor, the list of posts comprising the related content, the list of posts providing a history or context leading up to the particular post to the user.