I'm assuming the white dots are also connected subreddits but not enough to show a line? Most of the results I've tried are exactly what I expected e.g. users

I'm assuming the white dots are also connected subreddits but not enough to show a line? Most of the results I've tried are exactly what I expected e.g. users from my alma mater also post to the same regional subreddits. Were you able to find any interesting/unexpected connections?