Maybe it's just me but I wasn't aware about Twitter's direct message feature so to me this seemed like I would shout out which domains I was about to register. But then again I don't use Twitter that much.
Update: I just added the word "private" twice in the "How It Works" section.
Hopefully this is a good enough explanation for now. Though it still doesn't explain the intricacies of Twitter for the non-Twitter-user. Perhaps I should add a "more info" or FAQ. Thanks again.
Don't worry about it, if a user doesn't know what Tweets or direct messages are then the service isn't for them. You'll struggle to get people to start using Twitter just to register domains when there's plenty of good registrars already, most people will have their favourite they use regularly.
I see this more as a service for power Twitter users so they can easily register new domains after having a drunken idea.
