Hi, @Just_Curious, and welcome.
There have been some changes, all right, even though the GUI appearance has stayed pretty much the same. I joined in November of 2008, at a time when the site was busy and lively. I loved the fact that it was well moderated and that posts were held to a high standard. We had a few cranks and trolls, always have had, but the tone was upbeat and friendly, and we had some very steadying presences among us.
Here are a few samples. This one is the revered First Question posted on Fluther, by one of the co-founders, and it looks so choppy because he was testing things:
https://www.fluther.com/1/whats-so-special-about-salt-and-pepper/
That was October 16, 2006. The last post on that thread was a year later. For some of us, the page is almost a who’s who of the old-timers, most of whom are long gone, many still missed.
This post points back to that. Note @jca’s comment:
https://www.fluther.com/199034/what-was-the-first-question-ever-asked-on-fluther/
Here is one of several posts over time, listing Fluther memes. A few of these are still remembered, the frizzer in particular:
https://www.fluther.com/36605/does-everyone-know-about-fluther-isms/
@augustlan, the OP on that thread, was the much-beloved community manager at the time. Here she is at her 40k celebration:
https://www.fluther.com/140679/amazing-that-our-fearless-leadermomboss-ladywhip-wielding-dominatrix-augustlan-has-the-time/
Parties for milestones at 10k increments are an old Fluther tradition.
Auggie died on January 8th, 2019, leaving Fluther diminished and jellies grieving. Many of us still miss her keenly. Her three young daughters used to come around too.
https://www.fluther.com/212020/guys-i-have-some-sad-news-to-share/
Two other threads about Fluther memes, one from 2009:
https://www.fluther.com/31729/what-are-fluthers-memes/
and one from ten years later—rather a stark contrast:
https://www.fluther.com/214228/what-are-fluthers-current-memes/
You asked for milestones—interesting question!—and these are the ones I would list. Others may have more to add. Please note, I don’t know the right chronological order for these:
• appointment of Auggie as community manager
• addition of “awards” for lurve points
• separation of Qs, originally all in one basket, into General, Social, and Meta
• ability to view enlarged avatars on the profile pages, rather than the tiny thumbnails in threads
• death of Gail Calder (@gailcalled), 10/24/2015, aunt of co-founder Ben Finkel and one of the original jellies
• death of Auggie (@augustlan), 1/8/2019
• departure of Fluthergods Ben and Andrew (aka “Bendrew”) to work for Twitter; end of site development, now maintained through the kindness of Ben. This thread alludes to it; I couldn’t find the original announcement, which was several years earlier:
https://www.fluther.com/178108/what-was-fluther-sold-for-to-twitter/
There. I’m out of breath now. I hope someone else will add the marriage proposal thread (Gary @whatthefluther), which I think had the all-time highest number of posts. A happy memory.