Addmefast's twitter platform is OK at best.
There's a new project that's under development that deals with exactly what you're talking about. I'm one of the beta testers and I can tell you first hand that this will blow up once it's fully launched. The beta thread is somewhere around here.
Tell us more, any screenshots or anything? Whats it called?
TwitterMoneyBot will do this. I only use the trial version ($47 for the full thing) and retweets/favorites are a full version feature but I've heard it gets the job done.
Tell us more, any screenshots or anything? Whats it called?