If there is a thread called "Star Wars: The Force Awakens" and it has been released (obviously it has) then you can post spoilers in the thread. If people are going to be reading a thread titled "Star Wars: The Force Awakens" after the date of it's release then it can generally be assumed that the posts in the thread will be discussing things that are within the film.
If there is a thread called "House of Cards Season 4" then it can generally be assumed that the posts in the thread will be discussing things that are within aired episodes.
Essentially if you are not wanting an episode or film to be spoiled you probably shouldn't be reading a thread where people will be discussing that episode/film after the episode/film has been aired/released. To use Deadpool as an example, the moment the film had been released I stopped reading the Deadpool thread because I didn't want anything spoiled for me. To use Game of Thrones as an example for a TV series, I never read the GoT thread between the time of airing of an episode in the US and the time that I watch said episode here in the UK.
If you wanted to make a thread in which people are to discuss something without spoilers after the time of release, you could make a notice in the thread title saying "no spoilers please!" or something to that effect.




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