What was/is the longest thread ever on SDMB? Could it be: GQ: Are scalar weapons for real?
Were there any pre-crash humongous threads?
There was a huge thread about what would happen if other authors were to write the works of JRR Tolkien. That thread got mentioned on Slashdot, and so we got slashdotted. The servers held up astoundingly well (that is, they weren’t reduced to puddles of slag).
Back a long time ago (before my time), there was a thread called Mundane Pointless Stuff I Must Share. There’s a forum called that now, which gives you a hint how popular the thread was.
I think the infamous “a” thread still holds the record.
“Guy Stuff” was pretty darn long, but it’s been surpassed.
The “a” thread has 5337 replies over 107 pages.
If you go to the bottom of each forum, you can sort the posts by the number of replies and see the top 20 longest threads for each forum.
I’ll move this thread to ATMB since this is a question about this message board.
bibliophage
moderator GQ
Here’s the list as it stood at May 2003: What SDMB thread had the most replies ever?. If someone wants to update it, please feel free.
So, it ain’t this thread? Dang.
so who started the thread that gave its name a hole forum?
Well seeing how this tread was swept into the closet, we won’t have to worry about too many posts here. 
Thanks for the info folks.
MPSIMS has several current threads longer than the 1920s Style Death Ray Thread.
Song Title Game - 2407 posts
Oh, My Freaking God! (Looong!) - 2336 posts
Predict The Next Poster! - 2137 posts
Word Association Thread! - 1895 posts
Quote… …unquote game - 1382 posts
The hijack game. win absolutely nothing but your insanity… - 1341 posts
Question and Answer thread - 1189 posts
Good news/bad news – game - 1084 posts
Surreal continuing story: walking through doors and passageways - 828 posts
The consecutive number game - 813 posts
DC Lunch Bunch - 745 posts
I didn’t link, 'cause you can find them all on the front page of MPSIMS right now. No need to enrage the ham§sters.
How long did that “What if someone else wrote The Lord of the Rings?” thread finally get?
2021 replies as of this moment. Last post added was on September 8, 2003.
[defending the LotR thread]
On the other hand, most of the high-post-count MPSIMS threads weigh in at about a line or two per post, while half of the posts in the LotR authorship thread (the ones adding submissions, not the “wow that’s really good” ones) can get to a full screen. So I suspect that the LotR thread is still longest, in terms of word count.
[/defending the LotR thread]
We’ll see about that! Using the printer-friendly version…
**Thread Name replies filesize(kb) word count**
a 5338 1049 120419
Song Titles 2491 411 36698
OMFG! 2395 2058 123990
Next Poster 2211 702 77218
LotR 2022 3489 403595
Word Association 2016 207 19071