The problem with X? Meta, Microsoft, hundreds more own trademarks to new Twitter name

Billionaire Elon Musk’s decision to rebrand Twitter as X could be complicated legally.

Billionaire Elon Musk's decision to rebrand Twitter as X could be complicated legally: companies including Meta and Microsoft already have intellectual property rights to the same letter.

X is so widely used and cited in trademarks that it is a candidate for legal challenges - and the company formerly known as Twitter could face its own issues defending its X brand in the future.

"There's a 100% chance that Twitter is going to get sued over this by somebody," said trademark attorney Josh Gerben, who said he counted nearly 900 active U.S. trademark registrations that already cover the letter X in a wide range of industries.

Musk renamed social media network Twitter as X on Monday and unveiled a new logo for the social media platform, a stylised black-and-white version of the letter.

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Owners of trademarks - which protect things like brand names, logos and slogans that identify sources of goods - can claim infringement if other branding would cause consumer confusion. Remedies range from monetary damages to blocking use.

Microsoft since 2003 has owned an X trademark related to communications about its Xbox video-game system. Meta Platforms - whose Threads platform is a new Twitter rival - owns a federal trademark registered in 2019 covering a blue-and-white letter "X" for fields including software and social media.