Twitter is cool.
You can track, follow, use search terms, reTweet, refer and of course tweet – yeah baby yeah.
But it does not have groups.
Or maybe it does.
Check out Buzzable.
Join a group or make one and you can tweet to all the group members.
More info about Buzzable at TechCrunch.
From a Church point of view the group concept can be used to target specific ministry profiles. Twitter is great, but it broadcasts to all followers without prejudice. But with Buzzable the Church can further leverage the Social Networking concept of Twitter by allowing people to join groups within the Church so that the right information goes to the right people.