Wikimedia launched, Wikibooks, a collection of collaboratively written free textbooks and annotated texts, Wikimedia Commons, a site devoted to free-knowledge multimedia, Wikinews. "Systemic Bias in Wikipedia: What It Looks Like, and How to Deal with It". Lam, Shyong; Anuradha Uduwage; Zhenhua Dong; Shilad Sen; David. "Wikipedia Breaks Into US Top 10 Sites". Archived from the original on October 11, 2006. The Wikipedia's open structure makes it a target for trolls and vandals who malevolently add incorrect information to articles, get other people tied up in endless discussions, and generally do everything to draw attention to themselves.