In @HowardMarksBook's memo early this year, one key thing I realized is how wrong I was to dismiss some businesses because I thought they were overvalued simply after looking at the P/E, P/S ratio etc.

You can't determine a business is overvalued without knowing the in-depth qualitative fundamentals of the business, because otherwise where is your edge? Anyone in the world can simply look at a company's P/E ratio.
I know this seems obvious, but so many people on fintwit are very guilty of this - myself included.

Unless I really know and understand a business, even if it has a seemingly absurd P/E or P/S ratio, I will refrain from concluding it is overvalued. It's just lazy and wrong.
The weird thing about this is that when I'm normally researching a business, I totally understand this about valuation and do in-depth research and determine if it's undervalued. But then I'm quickly dismissive of a tech company that trades at 50x earnings and say it's overvalued

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The YouTube algorithm that I helped build in 2011 still recommends the flat earth theory by the *hundreds of millions*. This investigation by @RawStory shows some of the real-life consequences of this badly designed AI.


This spring at SxSW, @SusanWojcicki promised "Wikipedia snippets" on debated videos. But they didn't put them on flat earth videos, and instead @YouTube is promoting merchandising such as "NASA lies - Never Trust a Snake". 2/


A few example of flat earth videos that were promoted by YouTube #today:
https://t.co/TumQiX2tlj 3/

https://t.co/uAORIJ5BYX 4/

https://t.co/yOGZ0pLfHG 5/