1. A method comprising: by a mobile device associated with a user of a social network, identifying a set of search results in response to a search query; by the mobile device, displaying the set of search results organized in a hierarchy; by the mobile device, determining that one or more search results of the set of search results are associated with one or more information items, wherein at least one of the one or more information items is associated with the social network; by the mobile device, pre-fetching the one or more information items associated with the one or more search results; by the mobile device, receiving a first user interaction in connection with a first search result from the set of search results; by the mobile device, in response to the first user interaction, determining that: the first search result is associated with one or more of the pre-fetched information items; and one or more second search results from the set of search results are expanded; and by the mobile device, concurrently expanding the first search result and automatically collapsing the second search results, wherein the expanding the first search result comprises displaying the one or more pre-fetched information items associated with the first search result, and wherein the automatically collapsing the second search results comprises removing, from display, information items associated with the one or more second search results.