Digg threads become too full and the model just didn&#x27;t scale up. A thread with 10k up votes and 1000 comments is not inviting to new users. A stupid or insightful comment on such a thread will be completely ignored if it wasn&#x27;t the first post.<p>In contrast Reddit has thousands of small communities that let new users be heard.  Down voting and arguing over &quot;bad&quot; comments gives an impression of authority that make the user want to learn and impress the group.  It is really all just a game.