The lavish public areas at Abu are contemporary African in style and include a tranquil library and an adjoining communications center.

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"Twitter is a new kind of collection for the Library of Congress but an important one to its mission, " Gayle Osterberg, the library's director of communications, wrote in a blog post.

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The order stems from a decision by the Bush administration earlier this year to block the release of almost 70, 000 pages of confidential communications between President Ronald Reagan and his top advisers, that the Reagan library wanted to make public.

CNN: Bush aides move to put hold on some papers of past presidents