Facebook adds new Keyword Snooze button in News Feed to allow users to avoid spoilers
A new Keyword Snooze button is now available to those testing the feature in the upper right-hand menu in News Feed. You can use it to temporarily hide posts by keywords, which are pulled directly from text in that post.
For example, if you choose to snooze the word “westworld,” you will stop seeing any posts in your News Feed containing that exact word or phrase from any person, Page or Group for a maximum of 30 days.
Obviously, this doesn't guarantee that you won't get any spoilers even with the Keyword Snooze option enabled, but the chances become slimmer with every word that you add on the snooze list.