Twitter begins testing a 280 character limit
(blog.twitter.com)
Written By Jason
2017-09-26T22:16:00Z
We want every person around the world to easily express themselves on Twitter, so we're doing something new: we're going to try out a longer limit, 280 characters, in languages impacted by cramming (which is all except Japanese, Chinese, and Korean).
More confirmation that Manton is on the right track with micro.blog.