Post to Twitter from across a blog network?

Not sure if I can do this or not. There are several post to twitter plugins out there, where it posts to twitter when you publish a new post for example.

But is there such a plugin for a blog network. So when any member of your multisite network pulishes a new posts, it sends a tweet to a single account.

basically I have thousands of twitter followers and it would be good to tweet everytime a member of my blog network adds content.