To view feeds you use a
feed reader (also known as an aggregator).
A reader is designed to collect information about content from the places whose feeds
you've subscribed to. This could be as simple as using your web browser to collect the
feeds (recent versions of Firefox, Internet Explorer, and Safari support this). To try
this out, simply go to a community or
piece of content you want to receive updates on and click the feed icon
there. There are also reader applications that are specifically designed to
help you collect feeds.
For the feeds you've subscribed to, you'll typically get a list of summaries for content that has recently been added or changed. You can view the content itself or mark it in the list as having been "read."
To subscribe to the feed for content, you add the link URL for the feed to your feed aggregator. One way to get the URL is to click the feed icon when you're viewing content, then copy the URL out of the address bar at the top of your browser. You can also get the URL from a list of all the available feeds for a space by clicking Subscribe via RSS under Actions.