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Why Web Filters Don't Work: Penistone and the Scunthorpe Problem

60 videos recommended on HN
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2 HN users recommended this explainer2 months2017–2026 score 2
Years with an HN recommendation, 2007–2026

The go-to explainer whenever content filters wrongly flag innocent words, well made and short.

Tom Scott visits Penistone to explain the Scunthorpe problem, showing why naive web and profanity filters block innocent words.

“He talks about how it's impossible to implement with all edge-cases, easy to circumvent” (HN, 2020)

2 recommendations · 2 citations · Explainers

4 Hacker News comments

From the HN archive; up to 20 kept per video, favoring different commenters. Recommendations first.

@colemannugent Apr 2017 Recommends
on HN thread Scunthorpe Problem
Tom Scott did a video on this: Why Web Filters Don't Work: Penistone and the Scunthorpe Problem - [this video] It's well done, like the rest of his content.
Tom Scott on why web filters fail
@thepete2 May 2020 Recommends
on HN thread Scunthorpe Sans – a self-censoring font
There is a video [0] about this censoring-"problem" by Youtuber Tom Scott. He talks about how it's impossible to implement with all edge-cases, easy to circumvent and thus usually not a good idea. Fittingly, the video is filmed in Peniston. [0] [this video]
Why profanity filtering has edge cases and is easy to circumvent

Citations, criticism and jokes

@Crosseye_Jack Mar 2021 Cites it
on HN thread Tweeting “Memphis” autolocks your Twitter account
Penistone and Scunthorpe and now Memphis. [this video] As much as I dislike Twitter (I only really use it for work reasons) they are in a no win situation. They either moderate what people post with a flawed system that will never be 100% or be hounded by the "Why won't anyone think of the children" group.
The Scunthorpe problem applied to Twitter moderation
@varun_ch Aug 2026 Cites it
on HN thread Guiding Ships with Moire Patterns
With Tom Scott in particular, there’s a number of his videos that are kinda eerie to watch now with today’s LLM context eg. [this video]
Tom Scott video that feels eerie in the LLM era

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