In one embodiment, a method includes rendering an image comprising a plurality of tags, wherein each tag is associated with a particular location within the image, and wherein at least two tags of the plurality of tags are aggregated into an aggregated tag, calculating for each tag the distance of the location of the tag from the location of every other tag of the image responsive to the first user changing a zoom level for the image, and updating the aggregated tag based on the calculated distance of the locations of the tags to each other such that if the change in zoom level is zooming in, then the updated aggregated tag is aggregated with at least one fewer tag, and if the change in zoom level is zooming out, then the updated aggregated tag is aggregated with at least one more tag.