Here he is the moment he discovered that he had been accepted into Harvard University:
The video, taken by his father Edward Zuckerberg, shows a young Mark in his pyjamas sat at his computer checking emails.
It’s at that point that he opens the email from Harvard and discovers that he’s been accepted.
Zuckerberg would go on to Harvard to study psychology and computer science.
While at Harvard he came up with the idea of a website called Facemash that compared college students next to each other.
To accomplish this he hacked into Harvard’s database and took names and photos of all the students. Zuckerberg was almost expelled from the university for breaching its computer systems but the charges were ultimately dropped.
The following semester he would start work on a new website, one that used the college database but instead of ranking students would turn their information into profile pages, creating an online directory.
Called “thefacebook” it would ultimately grow into the social network we use today.
To help grow Facebook, Zuckerberg never finished college and dropped out in his Sophomore year to more to California.
Facebook now has almost 2 billion monthly active users, and owns a number of other apps and companies including Instagram and Oculus.
Commenting on the video he posted, Zuckerberg said: “My dad took this video when I got accepted to Harvard. Next week I’m going back for commencement to get my degree. #tbt”