Check out the first 10 members and how they knew Zuck >>

Check out the first 10 members and how they knew Zuck >>

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*A source close to the matter tells us user IDs were somewhat sequential but they were chunked up into per-school blocks up to 100,000 IDs. Harvard was the first chunk (0-99,999). My number is about 5,600,000, so its likely that Syracuse was roughly the 56th school on Facebook.

It's unclear when Zuckerberg opened up Facebook to the second school, so beyond those initial Harvard registrations, the number string following URLs may not be precise signup numbers, especially if a user joined Facebook outside of a college network.

1. Mark Zuckerberg

Original Profile ID: http://www.facebook.com /profile.php?id=4 (IDs 1-3 may have been associated with Zuckerberg but the profile pages no longer exist)

How he knew about Facebook: Zuckerberg founded Facebook.

2. Chris Hughes

Original Profile ID: http://www.facebook.com /profile.php?id=5

How he knew about Facebook: Hughes cofounded Facebook and was college roommates with Zuckerberg.

3. Dustin Moskovitz

Original Profile ID: http://www.facebook.com /profile.php?id=6How he knew about Facebook: Moskovitz cofounded Facebook and was college roommates with Zuckerberg.

4. Arie Hasit

Original Profile ID: http://www.facebook.com /profile.php?id=7How he knew about Facebook: Hasit was the first non-founder to sign up for Facebook. He was friends with early members David Hammer and Colin Jackson. Hammer knew Facebook cofounder Chris Hughes directly so its likely all three were friends.

5. Marcel Georgés Laverdet II*

Original Profile ID: http://www.facebook.com /profile.php?id=10 (IDs 8 and 9 do not exist) 

How he knew about Facebook: *While Laverdet has one of the earliest IDs, it's not certain that he was one of the first 20 to sign up for the site.  Some engineers who worked at Facebook saw some early IDs were open and snagged them for themselves.

Since Laverdet didn't go to Harvard, that's presumably what happened here. Laverdet is, however, friends with early Facebookers Chris Putnam, Soleio Cuervo, Kang-Xing Jin, Chris Hughes, Mark Zuckerberg, and his buddies Adam D'Angelo and Aaron Sittig.

Putnam and Marcel both got jobs at Facebook by creating hacks and pranks on the social site. These hacks caught the attention of cofounder Dustin Moskovitz, who contacted Putnam. The two kept in touch and when Putnam moved to Silicon Valley, Moskovitz offered him an interview at Facebook. When Putnam was hired, he encouraged Marcel to join the company too.

*He did not go to Harvard as originally stated. He went to LSU.

6. Soleio Cuervo

Original Profile ID: http://www.facebook.com /profile.php?id=11

How he knew about Facebook: Cuervo was friends with early Facebook members Kang-Xing Jin (16) and Marcel George Laverdet (5).

He later worked at Facebook and was responsible for the "Like" Button.

7. Chris Putnam*

Original Profile ID: http://www.facebook.com /profile.php?id=13 (ID 12 does not exist) 

How he knew about Facebook: *While Putnam has one of the earliest IDs, it's not certain that he was one of the first 20 to sign up for the site.  Some engineers who worked at Facebook saw some early IDs were open and snagged them for themselves. Since Putnam didn't go to Harvard, that's presumably what happened here.Putnam was, however, friends with early Facebookers Kang-Xing Jin and Marcel George Laverdet. Putnam and Marcel both got jobs at Facebook by creating hacks and pranks on the social site. These hacks caught the attention of cofounder Dustin Moskovitz, who contacted Putnam. The two kept in touch and when Putnam moved to Silicon Valley, Moskovitz offered him an interview at Facebook.

8. Andrew McCollum

Original Profile ID: http://www.facebook.com /profile.php?id=26 (IDs 14-25 do not exist)

How he knew about Facebook: McCollum was a Harvard student who was in Mark Zuckerberg's CS161: Operating Systems class. He was also friends with early Facebook member David Hammer.

9. Colin Kelly

Original Profile ID: http://www.facebook.com /profile.php?id=27

How he knew about Facebook: Kelly was a Harvard student who was friends with David Hammer and Colin Jackson. Both knew many early Facebookers and it's likely all of them were acquaintances.

10. Mark Kaganovich

Original Profile ID: http://www.facebook.com /profile.php?id=28

How he knew about Facebook: Kaganovich was a Harvard student who was also friends with early Facebooker David Hammer. Although Hammer joined Facebook after Kaganovich, Hammer knew at least 7 of the earliest Facebook members, and it's likely Kaganovich was acquaintances with many of them too.

Some of the first members were also the first employees. Check out:

The First 10 Facebook Employees: Where Are They Now????