Matt45710: I noticed the counter on the home page (before I signed in) was at something like 99,985 Saturday evening, and when I went back later it was around 100,025. I don't have any idea who the 100,000th person is.
Caslon, when I put the cursor (in Firefox) over the link to your profile, the number 10496 shows up as the ID number in your link (it's in the lower left-hand corner of my browser window). This is what your link looks like
If this is the right number, one could just type 100000 into the id= space and find the 100,000th profile. When you do that you'll find a profile that was added in early October, so that may not be correct.
On the other hand, it may be that the id number just continues to go up, even if an older profile is removed. That's why death_dodge is has an id number over 116,000.
mh2023's method could give us the right profile, but I think the folks at RJ are the only ones who can find out for sure. (I can also imagine that they might want to keep the fanfare to a minimum---for privacy's sake, etc).