‘X’ logo installed atop Twitter building, spurring San Francisco to investigate permit violation

Erecting a sign on top of a building also requires a permit, Hannan said Friday.

“Planning review and approval is also necessary for the installation of this sign. The city is opening a complaint and initiating an investigation,” he said in an email.

Musk unveiled a new “X” logo to replace Twitter’s famous blue bird as he remakes the social media platform he bought for US$44 billion last year. The X started appearing at the top of the desktop version of Twitter on Monday.

Musk, who is also CEO of Tesla, has long been fascinated with the letter X and had already renamed Twitter’s corporate name to X Corp. after he bought it in October. One of his children is called “X.” The child’s actual name is a collection of letters and symbols.

On Friday afternoon, a worker on a lift machine made adjustments to the sign and then left.