1. A computer-implemented method of serving content, comprising: at a server: providing to a first client a plurality of content items from a content feed for display in a first webpage at the first client; receiving information identifying one or more content items of the plurality of content items, wherein the one or more content items have been individually selected by a first user at the first client; and providing an executable script to the first client for display in the first webpage, the executable script being configured for copying and pasting into a second webpage distinct from the first webpage and for causing a respective client, when rendering the second webpage, to display or list the selected one or more content items.