It depends on what people are calling "popularity". There certainly is a tendency on all message boards to see a few people post far more eloquently and more intelligently than others. They tend to become well respected and their opinions valued, perhaps too much so. IF this is what is being referred to, it is simply a reflection of the medium of communication. Skill in written language trumps all in forums, and those who express their opinions most eloquently and without name calling, whining, and "trolling" are going to get more respect and more replies than others. When we know nothing about a person other than what they write, we have no recourse but to judge by what is written and how. Within those who write well, those who post often are likely to be perceived as more popular as those who post less simply because of their increased visibility. Personally though, I often find I have a great deal of respect for those that post seldom, but with very well thought out replies.
As far as "popularity" as it generally applies in real life, I'm as clueless as you. I can probably identify who is popular with less accuracy than NTs, but how popularity is determined and why there is a need for such things as popularity and cliques is utterly beyond my grasp. Indeed, I have come to the point I don't really care to understand such things, as they serve no useful purpose that I can identify and attempting to replicate these aspects of NT behavior seems to be a very difficult task with little benefit.
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Self-Diagnosed Dec. 2010
135 Aspie, 65 NT--Aspie Quiz
AQ 40
BAPD--124 aloof, 88 rigid, 83 pragmatic
EQ/SQ--21/78--Extreme systematizing