This document discusses external internal link building, which involves building internal links on external sites that are not owned by the linking party. It provides examples of ways to build these types of links, such as through social profiles on sites like Facebook, Wikipedia, and other social networks. Specific tactics mentioned include interlinking social profiles, linking to profiles from articles, and engaging with other users on platforms through comments and posts to potentially gain dofollow backlinks. The takeaway is that external internal link building involves finding sites with user profiles that allow dofollow links and engaging with those communities.