Abraham Lincoln Filed a Patent for Facebook in 1845 (opens in new tab)

http://news.ycombinator.com/item?id=3944856

Significant discussion there, including the fact that it's a hoax: http://news.ycombinator.com/item?id=3945848

Quoting that link:

    I contacted the curator at the Lincoln Museum by email.
    His reponse:

        This is entirely a hoax. Clever, too. We have an official
        statement to that effect due within the hour. -James

        James M. Cornelius, Ph.D. Curator,
        Lincoln Collection Abraham
        Lincoln Presidential Library & Museum
        112 N. Sixth St. Springfield,
        IL 62701-1310 217.785.7954
        http://www.alplm.org