[dcmatt]

But theirs is a design mark, just the design is trademarked, not the letter "X" itself. Important distinction

[chrisco255]

Probably the only thing that's actually trademarkable if your brand is a single letter.

[midoridensha]

Maybe, but I'm hoping Meta and Twitter will somehow get into a long, and very, very expensive courtroom battle over this.

[jacquesm]

Meta and X then...