1. A computer-implemented method comprising: presenting, in a visible region of an application-selectable user interface, a set of tiles associated with a set of applications; determining a subset of the set of tiles associated with a subset of applications for which new content is available, at least one tile of the subset of the set of tiles for which new content is available being associated with an application of the subset of applications that is not executing; determining that a number of tiles of the subset or a fraction of the subset relative to the set exceeds a pre-determined threshold; and progressively indicating in each of the tiles of the subset that new content is available.