This script creates pages about your website/blog on everyone of these websites, resulting in about 3,000+ different pages with backlinks pointing back to your website. Yes some of them are no-follow and some of them are do-follow, but bottom line is that these are well established websites regularly crawled by Google and other SE, so your pages and backlinks on those websites will be found and your website/blog will get backlinks and will be visited and indexed more frequently by Googlebot and mainly other search engine bots like Yahoo, Bing, Baidu, etc.
