Twitter is a great tool. But it doesn’t replace blogging – although it can suppliment it. There is a great service out there called TwitterFeed that will take any RSS feed and send new posts to your Twitter account automatically. That is great because people who are interested in your Tweets are probably also interested in your blog and this way you can promote your blog with no extra effort. And don’t forget you can use RSS feeds to automatically send new posts from your news or blog to other blogs, Facebook, etc.