On Thursday, Twitter updated the design of its app and website. Some users were baffled by a change to the “follow” and “unfollow” buttons that could lead one to mix them up. Others took issue with the new Twitter font, Chirp. While the social network boasted that Chirp is designed to be more accessible and amplify “the fun and irreverence of a Tweet,” many tweets complained that not only is it harder to read, users are complaining of headaches .