I’m member #11,659.
Nothing particularly notable about that, other than the fact that I have been here continuously for just over a decade. I average about a post per day (which makes this my daily post for today ;)).
However, I first read the original Straight Dope book back when it was released in paperback in 1986 or so, and I had an AOL membership in 1994, so I don’t know why it took me so long to find the SDMB online.
Apparently, we joined right at the same time, Quasimodem, separated by just one day and 13 member numbers.