Fountain Six was a search engine invented by Luke Rattigan when he was twelve years old in 2002. Its success made him a millionaire overnight. (TV: The Sontaran Stratagem)
Luke Rattigan was interviewed about Fountain Six, among other things, by Jeremy Fitzoliver for Metropolitan. (PROSE: The Secret Lives of Monsters)
It bases the results on a heuristic rather than a literal query raised against a relational database that's generated from the main internet hubs. Then the AI engine parses the query in terms a knowledge-based system can understand and returns the page hits.