Twitter has a slightly different font on Watch Project X Onlinethe web.
I wouldn't have noticed; the difference is fairly small compared to the old one (The Verge was the first to report on the change). In fact, as pointed out by NiemanLab's Joshua Benton, the font itself hasn't changed; it's still Twitter's own font called Chirp, but now it uses OpenType stylistic sets to make it easier to differentiate characters that are typically very similar, such as capital I and lowercase L, and zero (which now has a diagonal line over it) and o.
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These changes are only visible in Twitter handles, which is arguably where they're most useful, as they make it easier to differentiate real from fake accounts. Remember the endless variants of @e10nmusk prompting you to buy cryptocurrency? Now those swindlers will be easier to spot.
Oddly enough, the change isn't yet visible on mobile (see example below), though we reckon it's just a matter of time.

This is not the first time Twitter has made changes to the font it uses. Chirp replaced Segoe UI in Jan. 2021, and the company has used a number of different fonts throughout its history.
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This latest font change, however, gives hope that someone at Twitter really is trying to reduce spam and impersonations on the platform, as Elon Musk promised before he took over.
Topics X/Twitter