is expanding a 'downvote' button feature, that it began testing on a handful of users last year, to more people on web, iOS and Android.The negative reactions, captured by clicking a downward pointing arrow, won't be available to the public, or to the person who posted the original tweet. 'We learned a lot about the types of replies you don't find relevant and we're expanding this test,' the firm wrote in a tweet from its TwitterSafety account.
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