You can embed RSS feeds into your wiki the way you can embed YouTube videos and such. To embed an RSS feed into a wiki page, add something like this into the page:
This code would display slashdot's UTF-8 encoded RSS feed without showing the description text for each item, but instead showing the date for every item and showing maximum of five different items in the list. There are more parameters that you can use when using this extension; see the extension's manual.
It should be noted that RSS feed extension is not one of the most server-friendly extensions and thus you should use it with caution and never place it on the site notice or on the main page.