S. Sporcle
A highly effective time-waster, Sporcle is a quiz site that allows users to submit trivia quizzes across an assortment of categories, ranging from geography to gaming, for fellow users to complete. Surprisingly addictive, the site serves as one of the webs best way to procrastinate for a few minutes, or even hours, when boredom sets in. Honourable mentions go to Soundcloud, which has replaced MySpace as the primary way for up and coming musicians to showcase their work to others, Snopes, a highly informative urban legends database that acts as the webs equivalent of Mythbusters, and Skype, the video chat program that allows users with webcams to communicate with one another, and finds itself increasingly used for preliminary job interviews.
T. Twitter
For something so basic, Twitter has well and truly taken over the world, allowing anybody and everybody to tell the story of their life in 140 characters or less. An effective way of keeping up with the developments of individuals that inspire or interest you, the site is still in the ascendancy, and doesnt seem likely to stop growing any time soon. Honourable mentions go to the Trainline, which allows British citizens to sort out their train travel, once an annoying affair, in a simplistic manner, allowing them to organise their trips and print their tickets, as well as TV Tropes, another of the webs most effective sources of procrastination, serving as an encyclopaedia of clichés for every film, television series, book and video game imaginable.