The new X logo has started replacing the blue bird on the web.
Twitter is transforming into X, as the site’s former bird logo has now been replaced by an official new X logo. Elon Musk, who owns the transformed social media site, began signaling the change early Sunday morning with a series of tweets, starting with one that said, “and soon we shall bid adieu to the twitter brand and, gradually, all the birds.”
As has been pointed out elsewhere on the net, the Twitter branding was the most valuable part besides the already existing userbase. Having "tweeting" and as a verb in everyday English has been a godsend marketing specialists can only dream of and it has become so prevalent in news and journalism, it's both hilarious and depressing.
Elon is really working to make the dream of mainstream Mastodon and a big fediverse a reality.