He's the billionaire founder of the world's biggest social network.
But if an internet rumour turns out to be true, he once had a somewhat humbler web presence.
Mark Zuckerberg's rudimentary first personal website has apparently been discovered on an internet archive.
Reportedly made in 1999 when the Facebook CEO was 15 years old, it's potentially a revealing peak into the mind of the man who would become the king of the social web just a few years later.
It is not confirmed that the site is Zuckerberg's, and some have suggested it may be part of an elaborate hoax.
But according to the Internet Archive, which creates records of long-lost web pages, the site does appear to be at least 14 years old - and the website's code does reference Zuckerberg's full name.
The site includes a list of the author's likes and dislikes, as well as a prototype 'social web', an application designed to add colours to AOL Chat (illustrated by Darth Vader) and a magnetic poetry toy.
Referring to himself jokingly as "Slim Shady" the author of the site says that:
"my name is Mark (for those of you that don't know me) and I live in a small town near the massive city of New York. I am currently 15 years old and I just finished freshman year in high school. I have remodelled this website in an attempt that perhaps some search engine will recognize it."
Above: 'The Web'
One of the more interesting pages involves a tool called 'The Web', which is designed to illustrate your social network.
While not quite up to Facebook's standard - it requires friends to email 'Mark' and manually add their connections - it does have echoes of the idea that would one day make Zuckerberg one of the richest men on Earth.
The page explaining it says:
"As of now, the web is pretty small. Hopefully, it will grow into a larger web. This is one of the few applets that require your participation to work well. If your name is already on The Web because someone else has chosen to be linked to you, then you may choose two additional people to be linked with. Otherwise, if you see someone who you know and would like to be linked with but your name is not already on The Web, then you can contact me and I will link that person to you and put you on The Web."
There is also a page allowing users to test the thought problem that given infinite time monkeys at typewriters would come up with a perfect script for Hamlet.
Of course like any website by a 15-year-old, it's also pretty embarassing. A list of awards, for instance, includes some choice nuggets from the young author's life:
The best web presence - Me
The 2nd best web presence - Jesse
The best nerd - Daniel Saurstrom
The best donkey - David DeCicco
The best tolerance - Mike Sheerin
The best homey - Matt Schaeffer
The best computer - Douglas Kim
The best student - NOT Douglas Kim
The best athlete - NOT Douglas Kim
The best at StarCraft - STILL NOT Douglas Kim
The best saying for the year - Suck It!
The best quote - "Let there be light" - God
You can read the website here - though make sure your plug-in blocker and security settings are up to date. We experienced attempts to launch windows and scripts on the page, which are worth guarding against.