We've decided that Twitter might be useful after all, it certainly gives an easy way to post links to new websites.
Although a lot of tweets are simply daily static and mindless chatter that's impossible to understand unless you know the people involved and rewind all the tweets in a particular conversation, it has it's uses.
A quick way of letting the Internet, read Google, that a new website has been launched is always useful. An inbound link from an established website may also be a good thing, we'll see.