The Library of Congress has tweeted that it will to archive all public tweets made since March 2006.
Here's an excerpt from the blog announcement:
Have you ever sent out a "tweet" on the popular Twitter social media service? Congratulations: Your 140 characters or less will now be housed in the Library of Congress.
That’s right. Every public tweet, ever, since Twitter’s inception in March 2006, will be archived digitally at the Library of Congress. That’s a LOT of tweets, by the way: Twitter processes more than 50 million tweets every day, with the total numbering in the billions.
We thought it fitting to give the initial heads-up to the Twitter community itself via our own feed @librarycongress. (By the way, out of sheer coincidence, the announcement comes on the same day our own number of feed—followers has surpassed 50,000. I love serendipity!)
We will also be putting out a press release later with even more details and quotes. Expect to see an emphasis on the scholarly and research implications of the acquisition. I'm no Ph.D., but it boggles my mind to think what we might be able to learn about ourselves and the world around us from this wealth of data. And I'm certain we'll learn things that none of us now can even possibly conceive.