Question: Is there a meta thread about the history of Math.StackExchange? If the answer is no, then I propose that such a thread be created and used to record significant events in the life of the site. (I am aware of the anniversary posts, but they are written from personal perspectives of contributing users.)
Where this idea comes from. Long ago, on a distant website, a user asked "What's the story behind MathOverflow?". Mariano Suárez-Alvarez replied: This is the canonical question that should be asked on the meta site! Anton Geraschenko wrote an informative answer, and other users added details. It seems that nobody asked such a canonical question here yet.
What should be recorded. Creation of the site (proposed, beta tested, graduated). Technological innovations like TeX support and chat. Chronology of moderators. Base-10 milestones ($10^k$ users, $10^k$ questions, etc). Probably something else that I can't think of now. But nothing subjective or potentially inflammatory.
How could it be useful? Newcomers to the site will have a way to satisfy natural curiosity. Wikipedia editors (and journalists, if they still exist) will have a convenient source of information about Math.SE (I'm sure there will be an article about Math.SE eventually; there is one about MathOverflow, and Math.SE reaches more people). Users reading old meta threads will be able to interpret them properly, knowing that a certain post was written when its author was/was not a moderator. Former moderators will have their work formally recognized. I know the name of one of the original moderators only because I read a comment from 2011.
Using again MO as an example: *Brief history of MathOverflow* (far from complete, since it's just an example).
- September 2009: beta site goes live.
- October 2009: public announcement of the site.
- December 2009: first question closed by non-moderators (this is questionable, but it was seen as an important event at the time).
- June 2010: featured in the AMS Notices.
- October 2010: 10000 users
- June 2012: 10000 posts
- Jabrumaril 2013: migrated to StackExchange 2.0.
- September 2009 - October 2009: David Zureick-Brown, Daniel Erman, Anton Geraschenko, Scott Morrison
- October 2009 - June 2010: David Zureick-Brown, Daniel Erman, Anton Geraschenko, Scott Morrison, Ben Webster
- June 2010 - present: David Zureick-Brown, Scott Carnahan, François G. Dorais, Anton Geraschenko, Scott Morrison, Ben Webster
Unfortunately I do not know enough about the history of Math.SE to even begin: this is the job for an old-timer and/or Data.SE guru.