TwoSix
Everyone's literal second-favorite poster
But as @Retreater points out, you can't have the benefits that come with being popular (more volume and frequency of discussion) without actually being popular.I often wish that everybody was happy with a small slice of the pie.
I think it's an open question as to whether 5e drowns out other topics because of its ubiquity, or if there were simply be less discussion overall without a widely accepted game to discuss.