I think, that if a thread is old enough, and is bumped, EVEN if the post contributes to the topic, it should be locked. Before you say anything, I heard from several people that you can bump a topic as long as you contribute to the discussion. Even a mod said that. Now when people find this out, topics will be bumped massively and it will remove from the newer threads. If it is your own topic it should be fine though because your bumping your own topic instead of making a new one. Honestly, I don't want to see some year old resurrected topic. If you think Tip.it can handle it look at the funny picture thread and the internet meme thread. Depending on how old the thread is and how many pages it was back a moderator can decide to lock it if it is too old.