Twitter's boss has unveiled the social media site's new logo, featuring a white X on a black background, which will replace its blue bird.

In a tweet on Monday morning, Linda Yaccarino said "X is here! Let's do this."

"Tweets" will also be replaced, according to Twitter's owner Elon Musk, and posts will be called "x's".

The billionaire changed his profile picture to the new logo and added "X.com" to his Twitter bio.

Mr Musk wants to create a "super app" called "X" - his vision for a new kind of social media platform that he has been talking about creating for months.

On Sunday, the billionaire said he was looking to change Twitter's logo, tweeting: "And soon we shall bid adieu to the Twitter brand and, gradually, all the birds."

He then shared a picture of the new X branding projected onto the side of Twitter headquarters in San Francisco.

Mr Musk, who has changed the name of the business to X Corp, said the replacement "should have been done a long time ago".

Mr Musk posted an image of a flickering "X" on Twitter, and later in a Twitter Spaces audio chat, replied "Yes" when asked if the Twitter logo will change.

Ms Yaccarino wrote on the platform that the rebrand was an exciting new opportunity.

"Twitter made one massive impression and changed the way we communicate," she said.

"Now, X will go further, transforming the global town square."

The bird is called Larry which Twitter's co-founder Biz Stone said, in 2011, is a tribute to basketball star and Boston Celtics legend Larry Bird.