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TeX.SE is listed on Area 51. However, the right-hand column only references that "this site launched ... 8 years ago."

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It

before launching. When was the actual launch day/graduation?

It's not possible to establish this date purely based on questions on the site, since questions asked during the establishment phase on Area 51 - private and public beta - eventually end up on the site and therefore precede the launch date. As an example, the first question on TeX.SE (by reference in the URL as /questions/1) - Automatically define macros in LyX documents - is dated July 27, 2010.

Related: Tooltip showing date/time of site launch

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