News feed stories are ranked so that some stories appear above other stories for users of a social networking system. These “top” news stories are selected based on a ranking algorithm that incorporates an analysis of affinities for interests, users, and entities in the social networking system based on user interactions as well as story layout dimensions. The top news stories are presented in a multiple-column format, such as a grid format. Top news stories may be presented higher or in a more prominent placement among one or more columns in the story layout as compared to other news stories. The ranking of the top new news stories may change after a top news story is viewed. The multiple-column newsfeed enables a more visually pleasant placement of targeted advertisements on the social networking system.