Automatic Twitter updating whether it is adding followers automatically, adding tweets automatically, or getting followers automatically is a a growing industry. It also may very well be the downfall of Twitter if the Twitter team does not establish some sort of control over the automation of Twitter. Much like FFA(Free For All) pages of years ago,Twitter is at risk of becoming a spammers playground.
I too am guilty of using automated programs on Twitter. Recently I began experimenting with some services that enable the automation of your Twitter account. Be warned again. Be sure to give your followers some good tweets, not just automated tweets from feeds.