Google+ on Twitter would be more like a group DM. Twitter's mentions to users are public so mentions to lists could be to. I've got a list for people at work bu

Google+ on Twitter would be more like a group DM. Twitter's mentions to users are public so mentions to lists could be to. I've got a list for people at work but to mention them at the moment I have to name them individually. It would be great (though perhaps open to abuse) if I could tweet at my lists, or even the lists of others. This could be implemented with another character like "/". E.g. "@/foo" to mention my foo list or "@bar/baz" to mention @bar's baz list.