A system and method for displaying a post unit within a stream interface are provided. A stream interface is provided for display and comprises at least one post unit. For the at least one post unit, post content and a first interface set are provided for display on a first side of the post unit. The first interface set includes one or more interface components for interacting with the post content, and an expand interface component for expanding the first interface set. An indication of a user selection of the expand interface component is received. In response to the received indication, and for the at least one post unit, the post content and a second interface set are provided for display on a second side of the post unit. The second interface set includes a greater number or a different class of interface components for interacting with the post content.