(NBC News) — Graphic videos of animal abuse have circulated widely on Twitter in recent weeks, generating outrage and renewed concern over the platform’s moderation practices.

One such video, in which a kitten appears to be placed inside a blender and then killed, has become so notorious that reactions to it have become their own genre of internet content.

Laura Clemens, 46, said her 11-year-old son came home from his school in London two weeks ago and asked if she had seen the video.

“There’s something about a cat in a blender,” Clemens remembered her son saying.

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