Gosh, finally another web-based aggregator supports social navigation: Bloglines. That's what they say: shareyour news feeds and blogs to discover new friends and explore new communities. This is like rss4you. Which is cool, the idea is spread! BUt here it is just based on people's interest. The idea could go further.

Bloglines Recommendations, a feature that offers Amazon.com-like tailored suggestions of other feeds and blogs you might like based on your current subscription interests.(...). Bloglines introduced sharing capabilities such as the ability to email interesting blog articles to others, and make one's list of Bloglines subscriptions available to the view of friends and like-minded individuals.