https://techcrunch.com/2019/09/19/twitter-launches-its-controversial-hide-replies-feature-in-the-u-s-and-japan/

Twitter’s controversial “Hide Replies feature, aimed at civilizing conversations on its platform, is launching today in the U.S. and Japan after earlier tests in Canada. The addition is one of the more radical changes to Twitter to date. It puts people back in control of a conversation they’ve started by giving them the ability to hide those contributions they think are unworthy.

These replies, which may range from the irrelevant to the outright offensive, aren’t actually deleted from Twitter. They’re just put behind an extra click.