Forum Moderators: open
Not sure if link popularity is a factor or not as I see sites with very few links listed in this section.
It seems like the list is updated approximately every 3 months or so as we recently moved up.
My results have sites in them that have no links, are nowhere to be found in the listings (except the directory), and probably rarely ever get visits. My site used to be listed there, until I made a URL change. I get just as many visitors as I always did. Only change was to the URL. So, I can say for certain that it's not based on amount of visitors.
It looks to me to be more RANDOM than anything (at least in my category).
It depends heavily on the Category Name in the Directory.
If your Category is VEGETARIANS , then they rank the most popular for sites that rank high in the directory for that keyword. If you have a site about VEGETABLE JUICES, you won't show up on the most popular list, even if you have millions of more visitors than your competitor.
You have to rank high in the directory listing for the same keywords that are in the TITLE of your Directory Category. So, to get into the "most popular" section, your Vegetable Juice site would need to start promoting the VEGETARIAN keyword.
This is just my opinion from investigating over the last 10 minutes or so. I could very well be wrong, and I'm sure there are other factors involved.
In my case, many small companies are listed in the most popular section.
When i do a DIRECTORY search for the exact keywords that are in the TITLE of the Category, it's almost a match of the most popular list. The problem is that the keywords in the category title aren't keywords that I would normally target, so i'm not showing up there.
I tested this theory on many, many categories, and it appears to be pretty sound.