Google

Google was a popular search engine during the 21st century. Gwen Cooper used the site to find information on myths related to Death; Toshiko Sato questioned the reliability of her search results. (TV: Dead Man Walking)

The Eighth Doctor wondered if Mr Tluss had learned his name by searching it on Google. (PROSE: Best Seller)

Shirley1968 found Iaml's chat room by searching for it on Google. (PROSE: Lonely)

Bernice Summerfield googled herself in the library on the Prince of Mercury. (PROSE: The Ship of Painted Shadows)

Behind the scenes
In celebration of the 50th Anniversary of Doctor Who, Google released a Doctor Who game as their logo "doodle," codenamed the "whodle." It was one of the most complex doodles that Google had ever done, with 5 levels where the player worked to retrieve the six letters to the Google logo (possibly a sly reference to the Key to Time) while avoiding the Doctor's foes. Every incarnation of the Doctor was playable (if the player was killed by a baddie he would regenerate into the next Doctor, with infinite lives), and the Daleks, Cybermen, and Weeping Angels featured as villains.