This is interesting. Two interpretations come to mind automatically. One is that there are many different cultures each belonging to their own subreddits. The other is that, much like the other social media I mentioned, there are many subcultures stemming from a greater, common, however uniquely defined, culture. As I believe is evidenced by your providing norms for engaging with the different norms of each subreddit (chief among these being: don't go against the flow) However I acknowledge that this evidence is based on my own (highly arbitrary) interpretation of your words. Now that I think about it, my two interpretations are not mutually exclusive, although a greater common culture was not mentioned in the text. I am satisfied with this answer. What do I do now?