23 years old David Karp decided to drop out of high school at age 15, then deciding to be homeschooled.
At 17, he moved himself to Tokyo for five months where he was the chief technology officer of UrbanBaby, the New York-based message board and e-mail list for overprotective parents with a lot of disposable income and free time on their hands, thank God he decided to start his Japanese classes after he quit high school.
He founded tumblr (a Web platform inspired by the tumblelog, a blog format which enables short-form, mixed-media posts) at age 20, and he did all this without even attending college.
Karp said “he wanted to share his life instantaneously, and without the time commitment required of other blogging platforms. More than that, he wanted others to experience the satisfyingly speedy genesis of tumblelog posts”.
Tumblr is a blogging platform that allows users to post text, images, video, links, quotes, and audio to their tumblelog, a short-form blog. Users are able to "follow" other users and see their posts together on their dashboard. Users can "like" or "reblog" posts from other blogs on the site.
The site is now averaging 2,000,000 posts and 15,000 new users every day.