New York ( CNN ) -- The unregulated nature of the Web has aided a proliferation of cyber-hate , according to a report the Simon Wiesenthal Center for Tolerance released Monday . The report , Digital Terrorism and Hate 2010 , notes that there are about 11,500 hate-affiliated Web pages , a 20 percent jump from last year 's study . According to the Wiesenthal Center , personal blogs as well as mainstream social-networking sites such as Facebook , MySpace , YouTube and Twitter are easily flooded with racist and terrorist-related content . `` The spike is not in traditional Web sites in the United States , '' said Rabbi Abraham Cooper , associate dean of the Simon Wiesenthal Center . `` It 's more global and almost all in the social-networking area . '' Mark Weitzman , director of government affairs for the Wiesenthal Center and a co-author of the report , said home-grown terrorism suspects have an active online presence . He cited the case of a Pennsylvania woman who officials say called herself `` Jihad Jane . '' The woman , Colleen LaRose , has been indicted on charges of conspiracy to provide material support to terrorists and kill a person in a foreign country . She had been on the radar of the Wiesenthal Center for the past year , Weitzman said . `` We ask , 'Are they just coming out of the woodwork ? ' and the answer in every single case is the Internet link , '' Cooper said . Although these sites are monitored , the report 's authors said , they have become increasingly alarmed by the `` lone wolf '' effect , making it difficult for law enforcement to discern which threats are legitimate and which are simply talk . For example , the late James W. Von Brunn , the 88-year-old who was charged in the fatal shooting of a security guard at the National Holocaust Museum in Washington in June , kept a Web site called the Holy Western Empire . On it , he blamed a `` Negro jury , Jew/Negro attorneys '' and `` a Jew judge '' for a six-year prison term he served in the 1980s . However , `` there 's no equation that says someone who posts a rant ... is going to go on a shooting rampage , '' said Weitzman , who has testified in front of Congress and the United Nations on the issue of digital hate . Perhaps even more chilling are the growing numbers of `` how to '' Web sites in which terror groups routinely post instructional manuals and videos on bombmaking and computer hacking . The study also explored e-commerce and how it can be used to market hate . In February , an eBay merchant offered `` an original Holocaust ring , '' claiming that it came from his uncle who was posted at the Dachau concentration camp during World War II . EBay pulled the Web page before a sale was made . Founded in 1977 , the Simon Wiesenthal Center was named after a Jew who survived the Holocaust and became famous for his career as a Nazi hunter .
Internet 's unregulated nature has aided proliferation of cyber-hate , report says . Comment: Personal blogs , mainstream social-networking sites are affected , authors say .