How long does it take for supremacists to target you on YouTube? For one user, it was immediate. “I once clicked on some old German folk songs, and was then fed folk song videos of neo-Nazis,” the user explains.

“I did not regret having clicked on the politically correct folk songs... but rather that YouTube apparently thinks that those who listen to such songs are highly likely to be considered close to National Socialism.”

This is one of 28 crowd-sourced stories from people who claim their use of YouTube backfired, gathered by search engine Mozilla this week.

All of them argue the same thing: YouTube's algorithm is still broken and it causes users to fall down disturbing wormholes.

The issues are wide-ranging. According to the report, a horse-riding enthusiast was bombarded with animal porn.

In a separate incident, an eight-year-old girl was shown rotting skin and disfiguration after watching inspirational videos.

Meanwhile, a documentary about cod liver oil morphed into videos promoting a government conspiracy that entailed controlling people’s minds through the medium of fluoridated water.