Thread Necromancy = in forum lingo of the old days, is the act of attempting to revive a topic that is already old or answered by posting a new comment on it.
Since this forum is still relatively in its infancy, thread necromancy here in itself is not bad in most cases. Things will look bad though if the topics that are raised from the dead are of the 'Q and A' type where the correct answer is being rehashed repetitively in an endless cycle, and so those topics of the 'discussion' and 'personal open-ended question' types are safer and more legitimate to be raised.
But come on, isn't there any way we can be more creative enough for making more useful topics? And can't we just do things like having an actual discussion on a topic, no matter how old it is, rather than posting a single comment on it and being done with it, like most '1000-sat moneychasers' we've been noticing have been doing all along?
As of yet, there is no official rule stating that reviving old topics is prohibited (there is even a special rule allowing one to 'bump' old topics) but that doesn't mean that one should have the bright idea of reviving old topics just by spamming on it and allowing others to do the same, forcing the mods to lock an otherwise good old topic. We should do better by posting content that will refresh the topic with new information in one way or the other.