Which real websites which use flexbox

I have seen a lot of good examples and websites that show in details what is flexbox and how different attributes work. Because of their focus on explaining the concepts, the flex items in those examples are mostly colored divs with numbers (e.g. https://css-tricks.com/snippets/css/a-guide-to-flexbox/.)

However I am looking for real world examples of websites which use flexbox, that exhibit the potential of flexbox for practical uses.

From what I have searched and read so far, I have an impression that concept-wise flexbox is mature as evident by 1) the level of browser support (https://caniuse.com/#search=flexbox), 2) Availability of Facebook library for flexbox behavior (https://github.com/facebook/yoga), But web designers still don't use it much.

Can you please share any example of real websites that use flexbox?

I have read this closed question : Real world sites using flexbox However thats almost 4 years old, when flexbox module wasn't mature enough and so starting a new discussion.