1. A computing system comprising: a processor; and computer storage memory having computer-executable instructions stored thereon which, when executed by the processor, configure the computing system to facilitate presentation of search result items having varied prominence, the processor being operable, when executing the instructions, to: reference a search result item to be presented within a search results page in response to a search query; determine that a size prominence of the search result item is to be modified based on a click-through rate associated with the search result item exceeding a threshold value compared to click-through rates associated with one or more other search result items within the search results page, each of the search result item and the one or more other search result items being a different set of components displayed as a group adjacent to one another on the search results page; select a modified size prominence to which the size prominence is to be adjusted; and adjust the size of the search result item to the modified size prominence in accordance with the determination that the size prominence of the search result item is to be modified, the adjusting comprising increasing the vertical space allocation and a number of components of the search result item.