This Rails template uses Twitter OAuth, meaning you don't give away your username and password for Twitter. If an application "goes rogue" and starts posting unsolicited tweets or doing other nefarious practices, you can simply revoke access to the application from your Twitter account's "Connections" tab.

Twitter has a "Delete" option for Tweets so you could just manually remove any forged tweets. Of course you should still always be careful what services you associate with your Twitter account.