The Massachusetts Historical Society has since 2009 been tweeting a line a day from the journals of the 6th President of the United States, John Quincy Adams.
President Adams fils (son) has kept a journal since boyhood, having been encouraged to do so by his father, President John Adams, who also kept a journal and authored many essays and letters. In fact, this Adams family has been a goldmine for scholars of the early history of the United States of America since members in this family (including the women) documented many aspects of their lives - domestic and political, which at times were one and the same.
It turns out even further that President Adams fils also mantained a journal where he recorded what happened in his life, but only using about one line a day - clearly the ancestor of tweeting. It is from this journal that a project was set up to actually tweet these lines on the date that they were written (some 200 years to the date later) daily.
The Twitter handle is: http://twitter.com/#!/JQAdams_MHS.
The link to the Massachusetts Historical Society project: http://www.masshist.org/adams/jqa.php.