I won't get into how necromancy applies outside of the forum However, thread necromancy is against forum rules - you can post in it until six weeks after the most recent post, but after that you need to make a new thread for the topic. The only exception that i can remember is that for webcomics, the topic starter can post after the six weeks mark.
"DO NOT test my patience. I have little of it for those who would undermine my authority." High Queen Breydice of the Primus Imperium in Empire