I do not use twitter as often as I could, but I do find it to be beneficial for traffic flow. Using the appropriate hash marks also helps. For example, if your hub is about cars you could include the hash #cars or if your hub is about health you could include the hash #health. This will help your tweet become visible to those that follow or search those topics on twitter.
Another tip is to follow the topics/tweeters you write about. This will help build followers that are interested in your topic areas.