Are there certain topics that can be necrobumped or none? I don't see anything about it in the rules sections.
its generally frown upon. I say don't do it tho you'll see me do it. The reason being is i been at the forum for years and i can use discretion to know rather or not to post. I wouldn't do this at another forum because i don't know how that community behaves and therefore could bother someone/ upset that communities structure. Topics that only interest you or are out dated (in-regards to subject.) are obviously bad threads to bump. Topics in the spam section are not particularly an issues to necrobump. But again as with any thing if you have to ask rather or not to do it, then you probably shouldn't.
Bumping dead topics makes the forum messy. We keep things that are trending on the forefront, where as the old threads are for archive purpose only. We could lock all old threads to enforce the notion of not bumping threads after a certain duration of time but we're not here to police anyone. This is a place to get away from the daily burdens we all carry. We respect people and just ask that they not post in old topics. Its like this; it our house, your invite we just ask you not to be messy, and try to keep it clean. We'll clean up if a spill occurs but we're all able to look after our self's and that brings up the number one thing. Relax enjoy yourself and but be neat.
Oh...and as Magma Dragoon stated here are the base rules regarding necrobumping
http://www.infinitymugenteam.com/Forum_345/index.php?topic=17086.0
April Fools