"Effective Jan. 1, 2018, the Library will acquire tweets on a selective basis", it said in a blog post.
"The Library [chose to collect tweets] for the same reason it collects other materials - to acquire and preserve a record of knowledge and creativity for Congress and the American people".
The Library of Congress hopes that archive could become "one of this generation's most significant legacies to future generations".
It may sound odd, but since 2010 the library has been archiving your silly jokes and trolling on Twitter, in addition to any tweets of historical importance.
In 2010, Twitter sent the Library a full archive of every tweet posted to date, extending back to the social network's inception in 2006.
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Going forward, the old Twitter collection - documenting the first 12 years of the social media site - will be embargoed until a cost-effective and sustainable access solution is found.
"The nature of Twitter has changed over time", they argued, adding that, "The volume of tweets and related transactions has evolved and increased dramatically since the initial agreement was signed", and that "The Library only receives text". "Generally, the tweets collected and archived will be thematic and event-based, including events such as elections, or themes of ongoing national interest, e.g. public policy", the library said. The Library explained that tweets are "often more visual than textual, limiting the value of text-only collecting".
Nevertheless, the library's existing collection offers a "snapshot" of a unique moment in history, it said. With help from Twitter itself, the institution acquired all public tweet text (including by countless members of Congress and several U.S. presidents) published between 2006 and 2010 and a promise to do the same in the years to come.
More information is available in the attached white paper.
The library's decision, the result of a continuing evaluation of its practices, was driven by a number of factors, from the difficulty of maintaining the collection to the waning need for a comprehensive archive, the library said.
As the twelfth year of Twitter draws to a close, the Library has chose to change its collection strategy for receipt of tweets on December 31, 2017.