RSS is used by those who aren't into "social" addiction, but just want a quick listing of relevant news from a super-simple news feed (as in "really simple syndication"). A couple years ago Google embraced, extended and almost extinguished RSS, so I'm not sure RSS users are willing to obtain/share their feed URLs from a pointless central service; just go to the web sites you're reading frequently, check if they have an RSS feed announced in their HTML metadata (as indicated by an RSS symbol in eg. FF), and add the URL to your feeds.