Early connection to Facebook: Green has been associated with Facebook since the beginning. He initially helped Zuckerberg with Facebook's first iteration, Face Mash. Face Mash, a hot or not for students on campus, got them in trouble with the university. Green's father didn't want him to work on anything else with Zuckerberg again.
Still, Green was around as the social network unfolded. He reflected on its founding and his part in it via a recent Facebook post: "Ten years ago today we were in our dorm room in Kirkland House and Mark Zuckerberg pushed Facebook live, and we created accounts. Then we all called and emailed our friends at Harvard asking them to sign up," Green wrote.
What he's doing now: Green is the co-founder of FWD.us and he's an entrepreneur in residence at Andreessen Horowitz.
Early connection to Facebook: Saverin was Zuckerberg's rich friend who helped finance the company in its early days. He also worked on Facebook's early advertising efforts.
What he's doing now: After winning a legal battle with Facebook which let him retain his co-founder status, Saverin began angel investing in startups like Qwiki and Chris Hughes' Jumo. In 2011, Saverin (who was born in Brazil) renounced his U.S. citizenship, likely because of the taxes he'd have to pay following Facebook's public offering. He says he has no hard feelings when it comes to Facebook or Mark Zuckerberg, who ousted him from the company shortly after its launch.
How he knew about Facebook: He went to Harvard and was friends with other early Facebook members including Mark Kaganovich, Kang-Xing Jin, Andrei Boros, Colin Kelly, Andrew McCollum, Arie Hasit, and Chris Hughes.
Hammer recalls working with Zuckerberg and Jin early on the product. "I have vivid memories of hanging out with Mark and Kang-Xing in a dorm basement, looking at Facebook’s usage stats as they went through the roof and being pretty excited about it," he was told BuzzFeed.
What he's doing now: Hammer graduated from Harvard and joined Google. He's since founded a company, Emissary.io, which pays people to lend advice and help others network.
Early connection to Facebook: Jin went to Harvard and was in at least two of Zuckerberg's classes: CS182 - Intelligent Machines and CS121 - Introduction to Computational Theory. He worked on Facebook with Zuckerberg while they were at Harvard together.
What he's doing now: Jin joined Facebook after he graduated from Harvard in 2006. He's now Facebook's Director of Engineering.
How she knew about Facebook: Goodin was the first woman on Facebook. She was friends with other early Facebook member, Samyr Laine. Goodin lived in Straus Hall at Harvard. Laine was one of her hallmates, and he was Mark Zuckerberg's roommate.
What she's doing now: Goodin is getting her masters from California College of the Arts. She was formerly a publicity and marketing associate at Phaidon Press.
Early connection to Facebook:Laine was roommates with Mark Zuckerberg. He was a track and field athlete; he and Zuckerberg had different circles of friends. They played a lot of Play Station together and neither got much sleep.
What he's doing now: Laine competed in the 2012 London Olympics. He's writing a book and working on a foundation for Haiti children.
Early connection to Facebook: Aguilar's roommate, Mark Kaganovich, had a few math classes with Zuckerberg and was encouraged to sign up early for Facebook.
What he's doing now: Aguilar is in Guatemala. He was an analyst and trader. He's since co-founded two startups, a renewable energy company called Quetsol and a self-sufficient village for Guatemalan families called La Independencia. Aguilar is currently the president of a construction company, CASSA.
His connection to early Facebook: Kaganovich had a few math classes with Zuckerberg, according to BuzzFeed's Rob Fishman. "I remember [Zuckerberg] urging me to put up a profile picture, because I was slow to do so,” Kaganovich told Fishman. Tono Aguilar was Kaganovich's roommate.
What he's doing now: Kaganovich got his PhD from Stanford University in 2013. He's now the founder and CEO of SolveBio, a software company that analyzes heath data.
What he's doing now: Kelly has spent the last three or so years as a lawyer working on the Windsor vs. United States case which ruled that the government can't discriminate against same-sex marriages when it comes to federal benefits.
5. Andrew McCollum
Original Profile ID:26 (IDs 8-25 either do not exist or they were later assigned to Facebook engineers)
Early connection to Facebook: McCollum was a Harvard student who was in Mark Zuckerberg's CS161: Operating Systems class. Zuckerberg asked McCollum to design Facebook's first logo.
What he's doing now:McCollum joined Flybridge Capital Partners as an entrepreneur in residence in 2011. Then he became one at VC firm NEA. Now he's invested and involved in other tech startups, such as Quilt and JobSpice.
Early connection to Facebook: Hasit was the first non-founder to sign up for Facebook. Hammer knew Facebook co-founder Chris Hughes and Zuckerberg and credits himself with Facebook's birthday notifications feature. He told BuzzFeed the feature was added the day after he discussed it with Mark Zuckerberg.
What he's doing now: Hasit is a rabbi in Israel. He's a spiritual leader for a religious youth group there, NOAM.
Early connection to Facebook:Hughes co-founded Facebook and was college roommates with Zuckerberg.
What he's doing now:Hughes went on to co-found Jumo, a startup that tries to utilize social media to change the world. He is also an investor in UpWorthy, a viral news startup. His husband, Sean Eldridge, is interested in politics and in earning a congressional seat. The pair bought a multimillion-dollar home in the Hudson Valley, possibly with the hope of moving Eldridge's political career forward.
Original Profile ID:4 (IDs 1-3 may have been associated with Zuckerberg but the profile pages no longer exist)
Potential connection to early Facebook: Zuckerberg co-founded Facebook.
What he's doing now: Running Facebook.
Bonus: Marcel Laverdet, Soleio Cuervo and Chris Putnam all have early account numbers but they weren't the first people to sign up for Facebook.
Profile IDs: 10, 11, and 13 respectively (IDs 8, 9 and 12 do not exist)
How they knew about Facebook: While Putnam, Laverdet and Cuervo have early Facebook IDs, they weren't extremely early users of the site. Some engineers who worked at Facebook saw some early IDs were open and snagged them for themselves. That's what happened here.
The three got jobs at Facebook by hacking and pranking the social network. These hacks caught the attention of co-founder Dustin Moskovitz, who contacted Putnam. When Putnam moved to Silicon Valley, Moskovitz offered him an interview at Facebook. Laverdet and Cuervo were later hired too.
What they're doing now: They've all left Facebook. Cuervo is currently head of design at Dropbox.
Some of the first members were also the first employees. Check out: