Is there a twitter app that only follows new users?

Is there a twitter app that will auto follow people who have joined twitter over the past 3 days or so.. that you follow fresh users who don't really know how twitter works that way we can spam them with links and they won't get upset... LOL .. only jokin about the spamming or am i

i found half away to the answer and it's thsi

follow people on twitter with keywords that a newuser would use like
"i'm new" ect..

http://twitter.com/twitter/followers