14. A computer-implemented method comprising: displaying, by a web browser running in a device, (a) at least first and second content areas separately from each other on a webpage, and (b) at least a first content item at a location on the webpage other than in the first and the second content areas; receiving an indication of dragging, by a user of the web browser, of an element displayed on the webpage, and dropping, by the user, of the element into one of the first and the second content areas, the element selected from the group consisting of: the first content item, and a graphical element displayed in association with the first content item; if the indication is of dropping the element into the first content area, displaying in the first content area, by the web browser, at least a portion of a set of one or more second content items related to the first content item; and if the indication is of dropping the element into the second content area, displaying in the second content area, by the web browser, at least a portion of a set of one or more third content items related to the first content item.
23. The method according to claim 14 , wherein the first and the second content areas display content of different first and second content categories, respectively, and wherein: if the indication is of dropping the element into the first content area, the second content items are of the first content category of the first content area, and if the indication is of dropping the element into the second content area, the third content items are of the second content category of the second content area.