X is changing how the block button works
Engadget -

Elon Musk has made no secret that he’s not a fan of the block button. Now, X is changing how blocks work on its platform, though it’s (for now) stopping short of Musk’s wish of nuking the feature entirely. Instead, X is tweaking the visibility of replies in the context of a block. Previously, a user could block someone on X and still reply to their posts. And the person who was blocked wouldn’t be able to view that reply or know the person who had blocked them was engaging with their posts....

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