Twitter is working on new upvote and downvote reactions for tweets to accompany the usual options to retweet and reply. Twitter confirmed it was testing the feature for a small group of users on iOS, and it’s already been spotted according to multiple tweets from users that are part of the test group.
Twitter writes that iOS users may see upvote and downvotes in several different styles (up and down arrows, a heart icon and a down arrow, and thumbs up and thumbs down icons) and that it’s testing the feature to “understand the types of replies you find relevant in a convo, so we can work on ways to show more of them.” Currently votes are not public.