You can publish selected articles to a special RSS feed, accessible to anyone who knows the special randomly-generated URL. This works independently of GeneratedFeeds which allows you to share entire feeds, categories, etc.
You can mark articles as published by clicking standard feed icon near headline title:
Resulting URL is displayed in Preferences (Feeds
→
Published & shared articles
).
You can also publish articles automatically using filters
(Action
→ Publish article
).