"X is here! Let's do this," tweeted Yaccarino, who also posted a picture of the logo projected on the company's offices in San Francisco.
Both Yaccarino's and Musk's Twitter handles feature the X logo, although the Twitter blue bird is still visible across the platform.
"#GoodbyeTwitter" was trending on the platform with reference to the old logo as several users criticised the new one.
