I found this fascinating quote today:

If “joining the conversation” is one goal of your exploration of social media, it’s almost become a requirement that you maintain a presence on FriendFeed. It’s an application that acts as a central aggregation and discussion point for many of your other Internet points of presence. You can add your YouTube, Flickr, Twitter, Jaiku, Brightkite, Upcoming.org, Last.fm, and a gazillion other services into it, and then when you create activity on any of those services, other people following your activity stream can form commentary around what you’ve posted.FriendFeed- The Hidden Conversation | chrisbrogan.com, Jul 2008

You should read the whole article.