This is where the design challenge comes in: How can we make a UI that communicates these different character constraints that is still easily understood globally? Simply replacing the number doesn’t work because we can’t be certain which language you’re going to be Tweeting in. We could guess which language you’ll use, based on your location or system language, but that falls apart quickly, as many people live in foreign countries or travel regularly. Additionally, many people Tweet in multiple languages, sometimes within a single Tweet. Because we count dense alphabets differently than non-dense, mixed language Tweets can result in some intricate math that we want to be able to abstract away. The challenge here was to create a design that adapts to different character limits without relying on a number, works with the many ways people compose Tweets, and is intuitive enough that people don’t have to spend time thinking about it.
A recap of some of the UX decisions made to show that Twitter users now have 280 characters with which to compose their post, not 140.