When U.S. Airways Flight 1549 touched down on the frigid waters in the Hudson River on Jan. 15, 2009, Twitter, for many, was just a funny word in the dictionary. Fast forward five years and it's as ubiquitous as a bird in the sky.

What was deemed "the most successful ditching in aviation history" helped Twitter become the social media powerhouse it is today, and the now-public company has Janis Krums to thank.