Zuck is UID 4. UIDs are no longer allocated in ascending order since maybe early 2007ish.

Here's the full history of how FB UID's have been assigned over time: http://www.quora.com/What-is-the-history-of-Facebooks-user-I...

Mine is on the order of 503 million, and there definitely weren't five hundred million users when I joined in... late 2006, I think.

My own id is quite high, however... About a year ago I wrote a script to scrape Facebook users and their friendship information. I wanted to get the social graph of my university (Warwick), so I seeded it with me and a few random friends from the same school, and coded it expand nodes already well-connected to the network. It turns out that university students form a fairly tight international network, so my script starting scraping people from other universities, including some colleges in the US. Anyway, when I only had a few thousand users in the database, I noticed there was one with FBID 7 - Mark Zuckerberg's old roommate. Pretty cool how few hops were needed to get to him (and shows how FB managed to grow so quickly amongst the uni market).

600,343 (343rd user at Penn)

Assuming similar adoption rates at the 4 other "second wave" schools, I'm probably one of the first 5-10k users of Facebook.

504731 - 4731st at Dartmouth. They opened it during exam week when everyone was in the library and nearly the entire school registered on one day.

lemmings.

I'm 601804, also from Penn. Does 6xxxxx denote school?

Some prefixes from my friends lists:

100k = Columbia 200k = Stanford 300k = Yale 500k = Dartmouth 600k = Penn 1000k = Brown

Cornell = 400k, MIT = 700k, NYU = 800k, BU = 900k, Princeton = 1100k, UC Berkley = 1200k, Tulane = 1300k, Georgetown = 1400k, UVA = 1500k, and then I got bored.

You can keep plugging away IDs into http://facebook.com/profile.php?id=[id]

May I ask how you know your join-order at your school?

I'm guessing that 600,000 represents penn, but I am just guessing based on the numbers and what others have written.

9391, back from ye olde "The Facebook" days

I'm < 50,000 ... I have old screen shots of thefacebook.com too somewhere. In fact, I have an outstanding friend request from the early days that I've never clicked on, just for fun. I think this was either 2004 or 2003.

I'm 2305451 and I registered in November 2004 (I remember this because join date used to be prominently listed on all profiles)

homepage screenshot: http://bit.ly/q5P4kQ

It couldn't have been 2003. There was no Facebook then.

6,805,067 (2004)

29,005,604

Mine is less than 50...

{"user":0,"is_fb_employee":false}

No facebook account here. Do I win?

Are you logged in? Should be your user ID, not 0

No, see, I don't have a Facebook account. Therefore, I cannot log in.

11##

1,509,###. Joined in 2004 when it was still thefacebook.com. Winning so far (but not for long I imagine)

How many people here realize they are outing themselves by posting the whole number?