http://www.washingtonpost.com/world/national-security/twitter-sues-us-government-over-limits-on-ability-to-disclose-surveillance-orders/2014/10/07/5cc39ba0-4dd4-11e4-babe-e91da079cb8a_story.html
The Library of Congress already has and will have stored everything said on Twitter starting in 2010. See here... http://www.cnn.com/2013/01/07/tech/social-media/library-congress-twitter/
