[philip1209]

So the new Pixel includes U2F hardware in the device? That's cool - apparently, the flagship Chromebook has dormant U2F hardware, too.

Unfortunately, some providers (mainly Twitter) poorly implemented U2F by only allowing one device per account.

[colemickens]

Wow, so after it took them years to get U2F, you can only enroll one device? Is it still setup to require that you activate SMS 2FA too (thereby backdooring your entire 2FA process). I swear, I don't understand how Twitter is so utterly useless at things like this.