Alexandrou gives a brief overview of five
black-hat techniques, including link building with XSS and parasite hosting.
Link building with XSS is a way to exploit vulnerabilities in a site's underlying code to inject juice and PageRank-passing links back to your own. Parasite hosting is a method of hijacking a host that has established some trust and authority with the engines (like an old, underused WordPress URL) and setting up permanent redirects to another page you're monetizing.