newsticker-sort-method

newsticker-sort-method is a variable defined in `newst-plainview.el'.
Its value is

sort-by-original-order

Documentation:
Sort method for news items.
The following sort methods are available:
* `sort-by-original-order' keeps the order in which the items
appear in the headline file (please note that for immortal items,
which have been removed from the news feed, there is no original
order),
* `sort-by-time' looks at the time at which an item has been seen
the first time. The most recent item is put at top,
* `sort-by-title' will put the items in an alphabetical order.

You can customize this variable.