Twitter has made a few improvements to Twitter for Mac, incuding support for hign-resolution Retina displays.
Besides being more detailed on the highest resolution Mac notebooks, the new Twitter allows users to easier share photos, by clicking the camera icon in the lower-left corner of the Tweet compose box, and choose a photo to share.
In addition to English, Twitter for Mac now supports Dutch, French, German, Indonesian, Italian, Japanese, Korean, Malay, Portuguese, Russian, Simplified Chinese, Spanish, Traditional Chinese, and Turkish.
Along with these updates, Twitter for Mac offers keyboard shortcuts, support for multiple accounts and timelines, and other features.
You can get this update now in the Mac App Store