Everything is tagged
I usually wait around 2 days until i stop tagging spoilers.
I tag my spoilers as the abbreviation of the show's name + spoilers
Example: twspoilers for Teen wolf or gotspoilers for Game of thrones
48 hours after the episode has aired i expect everyone to have seen it or have it blacklisted
Basically, if you get spoiled after 2 days it's your own damn fault.
You can ask me to tag something so that you can blacklist it.