Last updated 2 June 2014.

Editors can now administer news feeds. If someone wants a feed for their group they should ask here or in the groups queue including a link to the feed and explanation of which group it's relevant for. Hopefully we won't have any low quality feeds that people ask to get aggregated, so I'm not going to try to lay out a policy other than "if in doubt about a feed's quality, post a question here." So, Editors should add the feed and then report back the feed ID value which is useful in the view...
There's a view of aggregated items which takes the feed ID as an argument. It takes multiple feed ids separated by comma to indicate multiple feeds.
When creating feeds please set the update interval to something long like 3 hours. If we start to see significant load from the aggregator items we'll need to tweak that.

Original source: https://groups.drupal.org/node/146179