“As it turns out, even Meta-formerly-Facebook has a federal trademark, which it registered in 2019, for a blue-and-white letter "X" — and it's directly related to "social networking services," presaging even more drama for Musk's troubled microblogging site.”
https://futurism.com/facebook-owns-trademark-x-social-media
It Turns Out Facebook Also Owns a Trademark to "X," Specifically for Social Media

Meta-formerly-Facebook has a trademark related to social media for the letter X, which means Elon Musk's Twitter rebrand could cost him.

Futurism
@tommyyum
26 possible options and he picks the worst one. We should start calling stupid choices that bite you in the butt “Elons”.
@jeber @tommyyum What a shitty outcome for a platform that should have been turned into a public utility.