Google Reader is a Rss reader which allows you to share your rss feeds with friends. I didn’t really get the hang of it and never figured out exactly how to add the feeds of friends. I already use netvibes to collate my RSS feeds, and without figuring out the sharing facilities, I didn’t feel compelled to persevere.
I have seen a number of ways of sharing rss feeds with friends. The one that seemed to work for me was Jaiku. This is a Microblogging system which i used before Twitter. It had a number of advantages over twitter, includeing the facility to share RSS feeds with friends, unfortunately the system was biurt out by google who then stopped supporting it and it therefore lost a number of its successful features, including the RSS feeds.