Facebook is not Exclusion, XML Vulnerability! It’s not serious flaw or bug, vulnerability, but this is proove that even such website’s contain security holes, and if you look through you can take them over. The code, behind this web sites, is written with PEOPLE, and you can only patch human vulnerability on their Mind or DNA. Oh yes, see NASA’s report about bugs, our UNIVERSE is vulnerable too. :))) The vulnerability is not a serious flaw.
Source: https://thehackernews.com/2011/04/facebook-is-not-exclusion-xml.html