You need your own site
Charlotte Jackson, experimenting on her own site:
I‘ve been super excited to see what all the fuss is about, so I have added flexbox to the simple header on this website. This also gave me a nice introduction to how it all works.
If you do anything at all on the web and you do not have your own web site to play around with you’re crazy. If you need one, I know of a platform that would love to have you.
/via Jeremy Keith.