Twitter has been experimenting with a new feature which allows users to vote on tweets.
This experiment is only taking place on the iOS version of the app. It involves up votes and down votes, much like Reddit. However, it will only be available on Tweet Replies and not original tweets.
Twitter has said they are testing this to understand the types of replies that users find most relevant. Downvotes won’t be publicly visible, and upvotes will be shown as likes. Currently this is viewed as a research project, but that’s not to say this couldn’t become a permanent feature.