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I just noticed that according to the main SE site, there's 110 SE sites. Which one was the 100th site?

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    Well, many of those sites are in beta, do you really want to count beta sites? Also note there have been a number of sites to be in beta and then end up being closed.
    – Servy
    Commented Nov 5, 2013 at 15:28
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    @Servy Good point, I think. The 'hundredth site' could actually change as older beta sites get removed too, I think. (Although one could still answer this historically, counting the deleted ones.) Hmm... how many graduated sites are there, anyway?
    – Andrew Barber
    Commented Nov 5, 2013 at 15:30
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    You planning a party? ;)
    – Lix
    Commented Nov 5, 2013 at 15:33
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    @Lix: Truthfully, I'm wondering if I missed one...
    – PearsonArtPhoto
    Commented Nov 5, 2013 at 15:35
  • I count 41 graduated, 69 beta.
    – PearsonArtPhoto
    Commented Nov 5, 2013 at 15:37
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    gamification.stackexchange.com is in private beta thus not listed in the all sites. So This makes 68 public beta sites and 42 graduated. @Andrew FYI as well. :)
    – Shadow Wizard
    Commented Nov 5, 2013 at 15:44
  • @ShaWizDowArd: That makes sense. 68 public, 1 private, 42 graduated, and 1 Area 51. Together is 110.
    – PearsonArtPhoto
    Commented Nov 5, 2013 at 15:46
  • @PearsonArtPhoto wait... something is still weird. According to this, only 35 are launched. So we have a gap of 6 sites! (excluding area51)
    – Shadow Wizard
    Commented Nov 5, 2013 at 15:48
  • OK, found one - patents.stackexchange.com was not launched through Area51 thus listed in All Sites but not in Area51. 5 more to go! :/
    – Shadow Wizard
    Commented Nov 5, 2013 at 15:51
  • Oh, Patents, Math Overflow, Super User, Stack Overflow, MSO, and Server Fault, I bet are the 6.
    – PearsonArtPhoto
    Commented Nov 5, 2013 at 15:52
  • @PearsonArtPhoto right on spot! So 42 it is.
    – Shadow Wizard
    Commented Nov 5, 2013 at 15:52
  • At which point should a site count as existing? Proposed? Defined? Private beta launch? Public beta? Graduated? If it's public beta, I think the "100th oldest currently existing site" is the best we can get.
    – John Dvorak
    Commented Nov 5, 2013 at 16:01
  • Definitely not proposed/defined. Private beta is the start point for a site. There isn't a great way of going back beyond that, but there is a few clues to older. I'm curious what others'll have to say on the matter.
    – PearsonArtPhoto
    Commented Nov 5, 2013 at 16:05
  • You guys missed Stack Apps (since you are counting Area 51)
    – asheeshr
    Commented Apr 18, 2014 at 2:01

2 Answers 2

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First of all, let's see how many closed sites we can add to the list. There are 6 well known closes that happened some time ago. Smugmug was also closed, started Feb 8, 2012. Artificial Intelligence was probably the first closure. Also closed early on is Gadgets. There was a few other briefly lived ones as well, but I'm going to try to not count ones that never left private beta. All in all, I count 10 known (To me, with searching) site closures. That means the real 100th site was up a bit, that'd put it at Genealogy & Family History.

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  • Were any of those closed beta sites created after Robotics?
    – Servy
    Commented Nov 5, 2013 at 16:07
  • Robotics was 1 year 1 month ago, none of them were after Robotics.
    – PearsonArtPhoto
    Commented Nov 5, 2013 at 16:09
  • Don't forget Gadgets
    – ale
    Commented Apr 18, 2014 at 1:32
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taking all currently listed sites, sorted from oldest (https://stackexchange.com/sites#oldest), taking the 100th element ($(".lv-item")[99]), yields the answer:

100th .. 103rd oldest currently existing sites (excluding private betas and area51) are these sites with the same age:

http://area51.stackexchange.com/?tab=beta (thanks @PearsonArtPhoto for the link) gives their age in greater precision and disambiguates this site as the oldest of these four, and thus the 100th oldest currently existing site:

Network Engineering

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    The 100th oldest site is not the 100th site to be created.
    – Servy
    Commented Nov 5, 2013 at 15:38
  • @Servy how come it is not?
    – John Dvorak
    Commented Nov 5, 2013 at 15:40
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    See my earlier comment. You aren't taking into consideration all of the sites that were created and then later removed. The 100th oldest living person on Earth is not the 100th person in to be created.
    – Servy
    Commented Nov 5, 2013 at 15:41
  • @Servy I am aware of this difference. I think this is the closest we can get.
    – John Dvorak
    Commented Nov 5, 2013 at 15:43
  • So it's impossible to know what sites have been created and then deleted? That information is lost forever? Or do you just mean that you can't find it in 10 seconds of looking.
    – Servy
    Commented Nov 5, 2013 at 15:44
  • @Servy do you have a better source of information? If you do, I will retract my answer
    – John Dvorak
    Commented Nov 5, 2013 at 15:45
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    I know that this answer isn't correct, that doesn't mean that I know what answer is correct. Me not knowing the real answer doesn't make this any more appropriate.
    – Servy
    Commented Nov 5, 2013 at 15:46
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    Network Engineering is the oldest of those (area51.stackexchange.com/?tab=beta)
    – PearsonArtPhoto
    Commented Nov 5, 2013 at 15:50

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