I have a PR4 expired domain. Can I create an URL like http://blog.pr4domain.com/ with WP and then post 100s -1000s of 7000-10000-word articles with images and YT videos and editorial-backlinks (low competition keywords) to the homepage of the PR4 domain - will the PR4 domain rank 1st page of Google solely on this type of backlinks ? I will of course do the onsite-SEO and social signals. Please tell me if the above, whether it's possible ? TIA.