“The Library of Congress, repository of the world’s largest collection of books, has set for itself the enormous task of archiving something less weighty and far more ephemeral — Americans’ billions of tweets. The venerable US institution is assembling all of the 400 million tweets sent by Americans each day, in the belief that each of the mini-messages reflect a small but important part of the national narrative.”
http://www.rawstory.com/rs/2013/01/21/library-of-congress-to-archive-americans-tweets/