Found in 1 comment on Hacker News
wimagguc · 2017-03-05 · Original thread
What a fantastic collection! For a go-to check, I ran the logos from a meme that was running on Twitter for some time ("Nothing is original: these are not the logos of Medium, Airbnb, Flipboard, and Beats": https://twitter.com/stefanotirloni/status/725065684862922753...) -- and behold, all the old ones pop up but none of the new ones.

Perhaps the source is this book? Logo Modernism: https://www.amazon.co.uk/Logo-Modernism-Jens-Müller/dp/38365... (source: still the Twitter thread.)

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