I studied some social psychology and there they use some kind of chart where statuses of people in groups can be defined just by marking down the interactions between people. So same could be done here. So everybody who gets the most answers to their posts or blogs or threads could have one point + or - point for each (depending on the comment). So roughly the person who gets the biggest number of + is the most popular kid on the block. It's very simple and linear thinking but I think it mostly works also.
I don't really mean that I would start counting but just based reading quite many threads a person could name the most popular people in MBTIc quickly. That is social interaction.