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Whenever there's a TV Tropes link in an answer, I always see messages like 'warnings! TV Tropes link' etc. I've visited TV Tropes, and I don't think there's any graphic explicit content (from what I've seen that is) in that site.

Sometimes even in comments, such warnings are posted, although I think this one was meant to be humorous.

Screenshot showing comments and people warning about TV Tropes links

marked as duplicate by Rand al'Thor discussion Feb 5 at 14:46

This question was marked as an exact duplicate of an existing question.

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Is it necessary?

No, not at all. It is just a joke*/meme that people get lost in a rabbit hole of links when going to TV Tropes and get distracted. Similar to how people sometimes describe YouTube's similar videos and people clicking through them all.

* Your mileage may vary.

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