Atlantis was from the bottom up. The posters. Jimmy came along and tried to be the top. He asked me and maybe some others to help run the place. We mostly departed for Yahoo Groups Atlantis 2. Nathaniel Branden had his own site there. They both lasted several years then petered out. Last fall Yahoo destroyed all those archives.
Libertarian(?) Tim Star set up his pro-Iraqi war site on Yahoo at about that time (2003). I was against that war. Because of that war I became much more libertarian oriented while he went the other way. But I was and am grounded in basic Objectivist philosophical principles. I still consider libertarianism to be without lasting philosophical roots and Rand to be the proper successor to Lockean individual rights which this country is built on.
Rand refused to sanction libertarianism but was so ham-fisted about it she hurt Objectivism more than libertarianism. This was also on and about the split with Branden. She (and Branden) had made Objectivism (off Galt's speech) a top downer while libertarianism was essentially a bottom upper.
I say "was" because both Objectivism and libertarianism have gone sub rosa. How strongly they will re-manifest themselves consequent to this virus scare, which is going to change the world for good or evil, remains to be seen.
The key will be the role of technology.
Atlantis was a libertarian site even though it had its Objectivists including the execrable Ellen Moore because dogmatists, like Ellen, had a hard time there, but nobody, as I imperfectly recall, ever asked for "civility" but that was okay with Ellen when Jimmy took over