Twitter is currently testing a new auto-translate feature for tweets on the Twitter desktop site, and it's powered by Bing.
The new translations appear directly under the original tweets, and they note the language in which the translation derives. The translations are only appearing for some Twitter users. Bing has yet to make any announcement, but Twitter has confirmed that they are testing the feature.
“To make it easier for people around the world to connect with each other, we are beginning to experiment with Tweet text translation,” says a Twitter spokesperson.
Here's what the new Bing-powered translation looks like (screenshot via The Verge):
Of course, Twitter wouldn't be the first major social network to offer Bing-powered translations. Facebook began offering Bing translations almost two years ago.
Earlier this month, Microsoft launched Bing Translator for Windows.