Spam blogs, sometimes referred to by the neologism splogs, are artificially created weblog sites which the author uses to promote affiliated websites or to increase the search engine rankings of associated sites. The purpose of a splog can be to increase the PageRank or backlink portfolio of affiliate websites, to artificially inflate paid ad impressions from visitors, and/or use the blog as a link outlet to get new sites indexed. Spam blogs are usually a type of scraper site, where content is often either inauthentic text or merely stolen  from other websites. These blogs usually contain a high number of links to sites associated with the splog creator which are often disreputable or otherwise useless websites. Splogs are blogs where the articles are fake, and are only created for search engine spamming. (source: wikipedia)

Is your blog one of it?