RSS Feed for Network add

This idea just dawn on me: what about creating an RSS feed for network that you belong to? I find myself tweeting this whenever I join a new network - this way it's good for the network as well as a good way to let your friends know that you're on it - like auto tweet: I just joined @tumblr! Follow me at http://seeminglee.tumblr.com or something similar like that. It would be good for everybody: win win win!!!