To the extent that the medium is the message, forums do encourage certain types and qualities of interaction. In that way, many, many subreddits are alike and t

To the extent that the medium is the message, forums do encourage certain types and qualities of interaction. In that way, many, many subreddits are alike and there is a single culture to it. Also the larger a community gets, the more mediocre and average it becomes and the more the culture that is reinforced by the medium comes to the fore.