Zuckerberg recalled the night he launched Facebook from his dorm in Kirkland House, telling his friend KX over pizza that he was excited to connect Harvard's community, but that one day someone would connect the whole world. At the time, it never occurred to him that 'someone' might be them — they were just college kids who didn't know anything, and there were big technology companies with far more resources. But the idea was so clear that they just kept moving forward, day by day.