Considering the sheer amount of things one can be spoiled by that doesn't seem like an issue that should be solved by the Stack Exchange network. There's at least the dimensions of what and when, possibly where.

Just consider this example:

>Bob, like many others doesn't like to get spoilers about *Game of Thrones, Stranger Things*, the *Marvel* stuff and for some reason *Suits*. On the other hand he couldn't care less about *Breaking Bad* and everything from *DC* on TV and cinema but loves the graphic novels regarding the latter (and uses that knowledge to avidly answer DC stuff). 

>Also Bob doesn't live in the US, so any given TV-series or movie reaches him from a few weeks earlier to six months later compared to the US release date.

To make Bob happy all those factors had to be considered. And that's just Bob. One could also easily image people only caring about spoilers regarding character deaths or hookups but not caring about the more general events.

***Summarizing, the configuration variables are too many.***

Thus, that doesn't seem like anything SE should tackle. However there are fantastic browser addons out there which tackle exactly that sort of thing. For example [unspoiler me](https://chrome.google.com/webstore/detail/unspoiler/oookgbbhgojdebhnmkmhgfagoiknifgi), which allows you to configure the stuff you don't want to be spoilered about yourself. And it works on any site, not just Stack Exchange.