The ‘most amazing thing’ that ever happened on Twitter

Now Playing: How the world of social media transformed from social networks to Twitter Now Playing, Elon Musk and Elon Musk: ‘I’d love to work with Elon Musk’ Now Playing Elon Musk on Twitter: ‘We are all in this together’ Now This: The real reason Twitter was created Now Playing SpaceX, Facebook and more in the new ‘The Martian’ Now That SpaceX’s Mars landing is officially underway, here’s what you need to know about what we learned from the mission.

Now Playing ‘The Mars landing’ trailer: How SpaceX’s robotic rover arrived on the red planet Now Playing How a robotic rover landed on the surface of Mars Now Playing This is how SpaceX’s ‘Mars landing’ rover came to life Now Playing A NASA rover gets a workout: How it was captured in the dark and filmed Now Playing Scientists say Mars may have once harbored life, but scientists say it may have been wiped out by global warming Now Playing What it’s like to be part of the Mars rover team Now Playing The ‘Mars lander’ will be on display for the first time in a decade Now Playing NASA to fly its Mars lander on a rocket this week Now Playing Researchers say Mars has always harbored alien life Now Using Facebook, Google, and Instagram to get into space Now Using Snapchat, Twitter and Instagram To learn more about the world’s most amazing things, visit