I was thinking about how to curb the problem of thread necromancy, and came with following idea.
1. Show a skull icon like this (but smaller):
on topic list next to threads that are not touched for 3/X months or more.
2. When replying to an old thread, show a big font red warning in a box like "
Warning: The thread you are posting in is long dead"
What do you think ?
UPDATE:3. When reading an old thread, show a big font red warning in a box like "
Warning: The thread you are reading is long dead"
Perhaps bigger version of the icon could be added to warnings as well, so they are more noticeable.