My site makes heavy use of the emoji font made by Twitter. They used to provide a CDN for it “https://twemoji.maxcdn.com/2/twemoji.min.js?12.0.0”.
It seems to be down as well. I knew it would happen with the whole Elon Musk stuff but that still makes me very unhappy.
On their Github repo check the CDN section: https://github.com/twitter/twemoji
MaxCDN is down.