No, you`re not crazy — Twitter has a new font
(Android Police)

Chirp has started rolling out for Twitter on the web Back in January, Twitter revealed that it had made a new branded font family for its products, called Chirp. (Get it — Twitter, Chirp?) After laying low for the last few months, based on user reports, that new Chirp font has started rolling out to the web version of Twitter starting today. Twitter using Segoe UI on Windows (left) and Chirp on macOS (right). The distinction between the old and new font sets vary. Read More No, you`re not crazy — Twitter has a new font was written by the awesome team at Android Police.