Show & Episode:
Supernatural – Hell House (S01E17)
When investigating a series of murders in a seemingly haunted abandoned cabin, Sam and Dean run into a pair of paranormal investigators. The investigators run a website called HellHoundsLair.com, which contains reports of paranormal instances.
WHOIS shows the domain is currently registered by Warner Bros. Entertainment, and is used to point to a website similar to the one displayed in the episode. While certain features from the episode aren’t in the actual website, such as a forum, it does contain links to a number of legends and the ability supposedly to submit your own stories. An excellent use of the domain and example of expanding a fictional universe into the real world.