[Air-L] ScraperWiki

Hi all - I'm doing a research project at Bowdoin College and trying to use ScraperWiki to gather tweets. ScraperWiki makes it very easy to gather tweets from all users on Twitter, but I'm looking to limit the data set to specific users. Is there a simple way to do this? If not - is there another program that will collect the data in a more streamlined way? Thanks, Roya Moussapour