Twitter is toying with a new tweet interaction that lets you upvote or downvote replies to tweets if you find them irrelevant. The new capability is available only to some iOS users for now.
Here are the top features and changes that Microsoft is bringing to Windows 11
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It appears that Facebook is testing a "Downvote" button which allows users to mark questionable comments as misleading, offensive, or off-topic. However, it is only intended for comment moderation.