#12 - June 10, 2015, 4:21 p.m.
'Necroing' forum posts is generally a negative term only when the post is bumped for the sole purpose of bringing the topic back up to the front page. If you have a legit question or update to make to a thread then I think as long as the topic is still relevant--and it's the best and most current thread on that topic--then replying to it would not be considered a necro (for the purposes of moderation).
If we want our search feature to be used, we need to be able to understand and handle old threads being brought up again if someone has a new question on it, or relevant and constructive info to add to it.