We were recently contacted by the folks at Twitter:
We’re writing to let you know that your application, EasyTweets, breaks our Automation Rules and Best Practices (http://help.twitter.com/forums/10711/entries/76915). Specifically, it facilitates automated following of users that appear in “continuous searches,” which is not allowed. It’s best for both our users and your users if your application follows the rules, so please make the necessary changes to bring your application into compliance.

