A globe icon may now appear in the top right corner of tweets that are not in the user's selected language. For those tweets, when the user clicks to expand them, the translated text will appear underneath the original.
The feature works on iOS, Android, the desktop and TweetDeck. Users can toggle the service on and off from their account settings on the desktop or laptap, where it says "show tweet translations."
In a test, the feature worked for translating tweets between English and languages including Spanish, Dutch, French, Italian, Japanese and Russian. One language pairing it doesn't appear to work for is Filipino to English, judging by this tweet by Pope Francis, which doesn't have the globe icon.
Results will likely vary and fall below the accuracy and fluency of translations that might be provided by a professional translator, Twitter says on the support page for the service.
Still, it's a useful and fun feature that could help facilitate more cross-border conversations and activity among people on Twitter's site.