User blog comment:Angren Túrë/Thread Psychology/@comment-22580009-20131021191914

I think the reason some threads go off topic and still stay are because that is how conversation flows. One topic leads into another. Some topics spill over because they apply to the other thread as well. Some threads manage to stay fairly on topic with only a few divergances, such as RWBY: The Game, seems to still be talking about a RWBY game. Others diverge because the topic exhausts itself. Overall, you can't define threads easily, as they all vary, much like the people involved in them.